Attachment 340797 Details for Bug 179391 – Patch (for CQ only)

[patch] Patch (for CQ only)

bug-179391-20180520210940.patch (text/plain), 773.92 KB, created by Emilio Cobos Álvarez (:emilio) on 2018-05-20 12:09:44 PDT

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Creator: Emilio Cobos Álvarez (:emilio)

Created: 2018-05-20 12:09:44 PDT

Size: 773.92 KB

patch

obsolete

>Subversion Revision: 232002
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 4434c93435d9ae0fa4a8b8b89f16b1e90724690f..b16c57e192cb98429cf7d355fa9e8ae4834d35cb 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,8 +1,38 @@
>+2018-05-20  Emilio Cobos Ãlvarez  <emilio@crisal.io>
>+
>+        [cssom] Make CSSOM APIs always append to the declaration block.
>+        https://bugs.webkit.org/show_bug.cgi?id=179391
>+
>+        This aligns us with Firefox and Blink which have already implemented
>+        the change in [1] and [2] respectively.
>+
>+        See [3] and [4] for spec text and discussion, and [5] for the blik-dev
>+        intent to implement and ship thread for more context.
>+
>+        I found a couple bits that don't really make sense from
>+        addParsedProperty anymore, which will fix separately with separate
>+        tests.
>+
>+        [1]: https://bugzilla.mozilla.org/show_bug.cgi?id=1415330
>+        [2]: https://bugs.chromium.org/p/chromium/issues/detail?id=782407
>+        [3]: https://drafts.csswg.org/cssom/#set-a-css-declaration,
>+        [4]: https://github.com/w3c/csswg-drafts/issues/1898
>+        [5]: https://groups.google.com/a/chromium.org/d/msg/blink-dev/lzBoa1EAQpI/strfpNczAwAJ
>+
>+        Tests: LayoutTests/imported/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-001.html
>+               LayoutTests/imported/web-platform-tests/css/cssom/cssstyledeclaration-setter-order.html
>+
>+        * css/StyleProperties.cpp:
>+        (WebCore::MutableStyleProperties::setProperty):
>+        (WebCore::MutableStyleProperties::setCustomProperty):
>+        (WebCore::MutableStyleProperties::addParsedProperty):
>+        * css/StyleProperties.h:
>+
> 2018-05-19  Eric Carlson  <eric.carlson@apple.com>
> 
>         Improve NowPlaying "title"
>         https://bugs.webkit.org/show_bug.cgi?id=185680
>         <rdar://problem/40296700>
> 
>         Reviewed by Dean Jackson.
> 
>diff --git a/Source/WebCore/css/StyleProperties.cpp b/Source/WebCore/css/StyleProperties.cpp
>index 30dbeb42b6b5a67a06fa9c65e0fdfc6deccf9086..fd99625c0555df51b02bd7b326bc95e3ff1720d9 100644
>--- a/Source/WebCore/css/StyleProperties.cpp
>+++ b/Source/WebCore/css/StyleProperties.cpp
>@@ -758,17 +758,16 @@ bool MutableStyleProperties::setProperty(CSSPropertyID propertyID, const String&
>     // Setting the value to an empty string just removes the property in both IE and Gecko.
>     // Setting it to null seems to produce less consistent results, but we treat it just the same.
>     if (value.isEmpty())
>         return removeProperty(propertyID);
> 
>     parserContext.mode = cssParserMode();
> 
>     // When replacing an existing property value, this moves the property to the end of the list.
>-    // Firefox preserves the position, and MSIE moves the property to the beginning.
>     return CSSParser::parseValue(*this, propertyID, value, important, parserContext) == CSSParser::ParseResult::Changed;
> }
> 
> bool MutableStyleProperties::setProperty(CSSPropertyID propertyID, const String& value, bool important)
> {
>     CSSParserContext parserContext(cssParserMode());
>     return setProperty(propertyID, value, important, parserContext);
> }
>@@ -777,17 +776,16 @@ bool MutableStyleProperties::setCustomProperty(const String& propertyName, const
> {
>     // Setting the value to an empty string just removes the property in both IE and Gecko.
>     // Setting it to null seems to produce less consistent results, but we treat it just the same.
>     if (value.isEmpty())
>         return removeCustomProperty(propertyName);
> 
>     parserContext.mode = cssParserMode();
>     // When replacing an existing property value, this moves the property to the end of the list.
>-    // Firefox preserves the position, and MSIE moves the property to the beginning.
>     return CSSParser::parseCustomPropertyValue(*this, propertyName, value, important, parserContext) == CSSParser::ParseResult::Changed;
> }
> 
> void MutableStyleProperties::setProperty(CSSPropertyID propertyID, RefPtr<CSSValue>&& value, bool important)
> {
>     StylePropertyShorthand shorthand = shorthandForProperty(propertyID);
>     if (!shorthand.length()) {
>         setProperty(CSSProperty(propertyID, WTFMove(value), important));
>@@ -795,49 +793,30 @@ void MutableStyleProperties::setProperty(CSSPropertyID propertyID, RefPtr<CSSVal
>     }
> 
>     removePropertiesInSet(shorthand.properties(), shorthand.length());
> 
>     for (unsigned i = 0; i < shorthand.length(); ++i)
>         m_propertyVector.append(CSSProperty(shorthand.properties()[i], value.copyRef(), important));
> }
> 
>-bool MutableStyleProperties::setProperty(const CSSProperty& property, CSSProperty* slot)
>+void MutableStyleProperties::setProperty(const CSSProperty& property)
> {
>-    if (!removeShorthandProperty(property.id())) {
>-        CSSProperty* toReplace = slot;
>-        if (!slot) {
>-            if (property.id() == CSSPropertyCustom) {
>-                if (property.value())
>-                    toReplace = findCustomCSSPropertyWithName(downcast<CSSCustomPropertyValue>(*property.value()).name());
>-            } else
>-                toReplace = findCSSPropertyWithID(property.id());
>-        }
>-        
>-        if (toReplace) {
>-            if (*toReplace == property)
>-                return false;
>-
>-            *toReplace = property;
>-            return true;
>-        }
>-    }
>-
>+    removeProperty(property.id());
>     m_propertyVector.append(property);
>-    return true;
> }
> 
>-bool MutableStyleProperties::setProperty(CSSPropertyID propertyID, CSSValueID identifier, bool important)
>+void MutableStyleProperties::setProperty(CSSPropertyID propertyID, CSSValueID identifier, bool important)
> {
>-    return setProperty(CSSProperty(propertyID, CSSValuePool::singleton().createIdentifierValue(identifier), important));
>+    setProperty(CSSProperty(propertyID, CSSValuePool::singleton().createIdentifierValue(identifier), important));
> }
> 
>-bool MutableStyleProperties::setProperty(CSSPropertyID propertyID, CSSPropertyID identifier, bool important)
>+void MutableStyleProperties::setProperty(CSSPropertyID propertyID, CSSPropertyID identifier, bool important)
> {
>-    return setProperty(CSSProperty(propertyID, CSSValuePool::singleton().createIdentifierValue(identifier), important));
>+    setProperty(CSSProperty(propertyID, CSSValuePool::singleton().createIdentifierValue(identifier), important));
> }
> 
> bool MutableStyleProperties::parseDeclaration(const String& styleDeclaration, CSSParserContext context)
> {
>     auto oldProperties = WTFMove(m_propertyVector);
>     m_propertyVector.clear();
> 
>     context.mode = cssParserMode();
>@@ -858,22 +837,29 @@ bool MutableStyleProperties::addParsedProperties(const ParsedPropertyVector& pro
>             anyChanged = true;
>     }
> 
>     return anyChanged;
> }
> 
> bool MutableStyleProperties::addParsedProperty(const CSSProperty& property)
> {
>+    // FIXME: This stopped looking at !important for non-custom properties in
>+    // https://webkit.org/b/159959, which is what some callers, mainly
>+    // mergeAndOverrideOnConflict, assume this function does.
>     if (property.id() == CSSPropertyCustom) {
>-        if ((property.value() && !customPropertyIsImportant(downcast<CSSCustomPropertyValue>(*property.value()).name())) || property.isImportant())
>-            return setProperty(property);
>-        return false;
>+        if (!property.value())
>+            return false;
>+        if (!property.isImportant() && customPropertyIsImportant(downcast<CSSCustomPropertyValue>(*property.value()).name()))
>+            return false;
>+        setProperty(property);
>+        return true;
>     }
>-    return setProperty(property);
>+    setProperty(property);
>+    return true;
> }
> 
> String StyleProperties::asText() const
> {
>     StringBuilder result;
> 
>     int positionXPropertyIndex = -1;
>     int positionYPropertyIndex = -1;
>diff --git a/Source/WebCore/css/StyleProperties.h b/Source/WebCore/css/StyleProperties.h
>index 2661ec1121108a635065dc6a250145d6d5649a39..b6ade6e90a3c56ea3f59fc59c0924bf4c0e1f63b 100644
>--- a/Source/WebCore/css/StyleProperties.h
>+++ b/Source/WebCore/css/StyleProperties.h
>@@ -223,19 +223,19 @@ public:
>     bool addParsedProperty(const CSSProperty&);
> 
>     // These expand shorthand properties into multiple properties.
>     bool setProperty(CSSPropertyID, const String& value, bool important, CSSParserContext);
>     bool setProperty(CSSPropertyID, const String& value, bool important = false);
>     void setProperty(CSSPropertyID, RefPtr<CSSValue>&&, bool important = false);
> 
>     // These do not. FIXME: This is too messy, we can do better.
>-    bool setProperty(CSSPropertyID, CSSValueID identifier, bool important = false);
>-    bool setProperty(CSSPropertyID, CSSPropertyID identifier, bool important = false);
>-    bool setProperty(const CSSProperty&, CSSProperty* slot = nullptr);
>+    void setProperty(CSSPropertyID, CSSValueID identifier, bool important = false);
>+    void setProperty(CSSPropertyID, CSSPropertyID identifier, bool important = false);
>+    void setProperty(const CSSProperty&);
> 
>     bool removeProperty(CSSPropertyID, String* returnText = nullptr);
>     void removeBlockProperties();
>     bool removePropertiesInSet(const CSSPropertyID* set, unsigned length);
> 
>     void mergeAndOverrideOnConflict(const StyleProperties&);
> 
>     void clear();
>diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
>index a261cb3715e8ef9e3ac9e7787282de6b1e04fba3..c64cb108853b9771e6342a9d3735b2093181908e 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,8 +1,19 @@
>+2018-05-20  Emilio Cobos Ãlvarez  <emilio@crisal.io>
>+
>+        Update CSSOM WPT tests.
>+        https://bugs.webkit.org/show_bug.cgi?id=185805
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Update CSSOM WPT tests.
>+
>+        * TestExpectations:
>+
> 2018-05-18  Commit Queue  <commit-queue@webkit.org>
> 
>         Unreviewed, rolling out r231982.
>         https://bugs.webkit.org/show_bug.cgi?id=185793
> 
>         Caused layout test failures (Requested by realdawei on
>         #webkit).
> 
>diff --git a/LayoutTests/imported/w3c/ChangeLog b/LayoutTests/imported/w3c/ChangeLog
>index 19edc7cfd521290a770e58cfd6fcfcf0d3d4fdb0..ca36684130e29bba3002296998e8aa9ef00b5b0f 100644
>--- a/LayoutTests/imported/w3c/ChangeLog
>+++ b/LayoutTests/imported/w3c/ChangeLog
>@@ -1,8 +1,262 @@
>+2018-05-20  Emilio Cobos Ãlvarez  <emilio@crisal.io>
>+
>+        [cssom] Make CSSOM APIs always append to the declaration block.
>+        https://bugs.webkit.org/show_bug.cgi?id=179391
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Rebaselined tests to account for the progression.
>+
>+        * web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-001-expected.txt:
>+        * web-platform-tests/css/cssom/cssstyledeclaration-setter-order-expected.txt:
>+
>+2018-05-20  Emilio Cobos Ãlvarez  <emilio@crisal.io>
>+
>+        Update CSSOM WPT tests.
>+        https://bugs.webkit.org/show_bug.cgi?id=185805
>+
>+        They've been moved under the css/ directory.
>+
>+        This has been done with:
>+
>+          ./Tools/Scripts/import-w3c-tests web-platform-tests/css/cssom
>+          rm -rf LayoutTests/imported/w3c/web-platform-tests/cssom
>+          ./Tools/Scripts/run-webkit-tests -t Debug LayoutTests/imported/w3c/web-platform-tests/css/cssom/ --reset-results
>+
>+        And ensuring that the same run without --reset-results also succeeded.
>+
>+        I manually removed entries in import-expectations.json which no longer
>+        correspond to an upstream directory.
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * resources/import-expectations.json:
>+        * resources/resource-files.json:
>+        * web-platform-tests/css/cssom/CSS-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSS-expected.txt.
>+        * web-platform-tests/css/cssom/CSS.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSS.html.
>+        * web-platform-tests/css/cssom/CSSKeyframeRule-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframeRule-expected.txt.
>+        * web-platform-tests/css/cssom/CSSKeyframeRule.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframeRule.html.
>+        * web-platform-tests/css/cssom/CSSKeyframesRule-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframesRule-expected.txt.
>+        * web-platform-tests/css/cssom/CSSKeyframesRule.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframesRule.html.
>+        * web-platform-tests/css/cssom/CSSNamespaceRule-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSSNamespaceRule-expected.txt.
>+        * web-platform-tests/css/cssom/CSSNamespaceRule.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSSNamespaceRule.html.
>+        * web-platform-tests/css/cssom/CSSRuleList-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSSRuleList-expected.txt.
>+        * web-platform-tests/css/cssom/CSSRuleList.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSSRuleList.html.
>+        * web-platform-tests/css/cssom/CSSStyleRule-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleRule-expected.txt.
>+        * web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-expected.txt: Added.
>+        * web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-namespace-expected.txt: Added.
>+        * web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-namespace.html: Added.
>+        * web-platform-tests/css/cssom/CSSStyleRule-set-selectorText.html: Added.
>+        * web-platform-tests/css/cssom/CSSStyleRule.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleRule.html.
>+        * web-platform-tests/css/cssom/CSSStyleSheet-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleSheet-expected.txt.
>+        * web-platform-tests/css/cssom/CSSStyleSheet.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleSheet.html.
>+        * web-platform-tests/css/cssom/MediaList-expected.txt: Added.
>+        * web-platform-tests/css/cssom/MediaList.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList.html.
>+        * web-platform-tests/css/cssom/MediaList2-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList2-expected.txt.
>+        * web-platform-tests/css/cssom/MediaList2.xhtml: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList2.xhtml.
>+        * web-platform-tests/css/cssom/OWNERS: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/OWNERS.
>+        * web-platform-tests/css/cssom/StyleSheetList-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/StyleSheetList-expected.txt.
>+        * web-platform-tests/css/cssom/StyleSheetList.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/StyleSheetList.html.
>+        * web-platform-tests/css/cssom/computed-style-001-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/computed-style-001-expected.txt.
>+        * web-platform-tests/css/cssom/computed-style-001.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/computed-style-001.html.
>+        * web-platform-tests/css/cssom/computed-style-002-expected.txt: Added.
>+        * web-platform-tests/css/cssom/computed-style-002.html: Added.
>+        * web-platform-tests/css/cssom/computed-style-003-expected.txt: Added.
>+        * web-platform-tests/css/cssom/computed-style-003.html: Added.
>+        * web-platform-tests/css/cssom/computed-style-004-expected.txt: Added.
>+        * web-platform-tests/css/cssom/computed-style-004.html: Added.
>+        * web-platform-tests/css/cssom/css-style-attr-decl-block-expected.txt: Added.
>+        * web-platform-tests/css/cssom/css-style-attr-decl-block.html: Added.
>+        * web-platform-tests/css/cssom/css-style-attribute-modifications-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-attribute-modifications-expected.txt.
>+        * web-platform-tests/css/cssom/css-style-attribute-modifications.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-attribute-modifications.html.
>+        * web-platform-tests/css/cssom/css-style-declaration-modifications-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-declaration-modifications-expected.txt.
>+        * web-platform-tests/css/cssom/css-style-declaration-modifications.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-declaration-modifications.html.
>+        * web-platform-tests/css/cssom/css-style-reparse-expected.txt: Added.
>+        * web-platform-tests/css/cssom/css-style-reparse.html: Added.
>+        * web-platform-tests/css/cssom/cssimportrule-expected.txt: Added.
>+        * web-platform-tests/css/cssom/cssimportrule.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssimportrule.html.
>+        * web-platform-tests/css/cssom/cssom-cssText-serialize-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssText-serialize-expected.txt.
>+        * web-platform-tests/css/cssom/cssom-cssText-serialize.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssText-serialize.html.
>+        * web-platform-tests/css/cssom/cssom-cssstyledeclaration-set-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssstyledeclaration-set-expected.txt.
>+        * web-platform-tests/css/cssom/cssom-cssstyledeclaration-set.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssstyledeclaration-set.html.
>+        * web-platform-tests/css/cssom/cssom-fontfacerule-constructors-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule-constructors-expected.txt.
>+        * web-platform-tests/css/cssom/cssom-fontfacerule-constructors.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule-constructors.html.
>+        * web-platform-tests/css/cssom/cssom-fontfacerule-expected.txt: Added.
>+        * web-platform-tests/css/cssom/cssom-fontfacerule.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule.html.
>+        * web-platform-tests/css/cssom/cssom-ruleTypeAndOrder-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-ruleTypeAndOrder-expected.txt.
>+        * web-platform-tests/css/cssom/cssom-ruleTypeAndOrder.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-ruleTypeAndOrder.html.
>+        * web-platform-tests/css/cssom/cssom-setProperty-shorthand-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-setProperty-shorthand-expected.txt.
>+        * web-platform-tests/css/cssom/cssom-setProperty-shorthand.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-setProperty-shorthand.html.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-csstext-expected.txt.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-csstext-final-delimiter-expected.txt: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-csstext-final-delimiter.html: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-csstext-important-expected.txt: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-csstext-important.html: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-csstext.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-csstext.html.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-mutability-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-mutability-expected.txt.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-mutability.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-mutability.html.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-001-expected.txt: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-001.html: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-002-expected.txt: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-002.html: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-003-expected.txt: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-003.html: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-004-expected.txt: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-004.html: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-setter-order-expected.txt: Added.
>+        * web-platform-tests/css/cssom/cssstyledeclaration-setter-order.html: Added.
>+        * web-platform-tests/css/cssom/escape-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/escape-expected.txt.
>+        * web-platform-tests/css/cssom/escape.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/escape.html.
>+        * web-platform-tests/css/cssom/font-shorthand-serialization-expected.txt: Added.
>+        * web-platform-tests/css/cssom/font-shorthand-serialization.html: Added.
>+        * web-platform-tests/css/cssom/getComputedStyle-detached-subtree-expected.txt: Added.
>+        * web-platform-tests/css/cssom/getComputedStyle-detached-subtree.html: Added.
>+        * web-platform-tests/css/cssom/getComputedStyle-dynamic-subdoc-expected.txt: Added.
>+        * web-platform-tests/css/cssom/getComputedStyle-dynamic-subdoc.html: Added.
>+        * web-platform-tests/css/cssom/getComputedStyle-pseudo-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/getComputedStyle-pseudo-expected.txt.
>+        * web-platform-tests/css/cssom/getComputedStyle-pseudo.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/getComputedStyle-pseudo.html.
>+        * web-platform-tests/css/cssom/historical-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/historical-expected.txt.
>+        * web-platform-tests/css/cssom/historical.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/historical.html.
>+        * web-platform-tests/css/cssom/inline-style-001-expected.txt: Added.
>+        * web-platform-tests/css/cssom/inline-style-001.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/inline-style-001.html.
>+        * web-platform-tests/css/cssom/insertRule-charset-no-index-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-charset-no-index-expected.txt.
>+        * web-platform-tests/css/cssom/insertRule-charset-no-index.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-charset-no-index.html.
>+        * web-platform-tests/css/cssom/insertRule-import-no-index-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-import-no-index-expected.txt.
>+        * web-platform-tests/css/cssom/insertRule-import-no-index.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-import-no-index.html.
>+        * web-platform-tests/css/cssom/insertRule-namespace-no-index-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-namespace-no-index-expected.txt.
>+        * web-platform-tests/css/cssom/insertRule-namespace-no-index.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-namespace-no-index.html.
>+        * web-platform-tests/css/cssom/insertRule-no-index-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-no-index-expected.txt.
>+        * web-platform-tests/css/cssom/insertRule-no-index.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-no-index.html.
>+        * web-platform-tests/css/cssom/insertRule-syntax-error-01-expected.txt: Added.
>+        * web-platform-tests/css/cssom/insertRule-syntax-error-01.html: Added.
>+        * web-platform-tests/css/cssom/interfaces-expected.txt: Added.
>+        * web-platform-tests/css/cssom/interfaces.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/interfaces.html.
>+        * web-platform-tests/css/cssom/medialist-dynamic-001-expected.html: Added.
>+        * web-platform-tests/css/cssom/medialist-dynamic-001.html: Added.
>+        * web-platform-tests/css/cssom/medialist-interfaces-001-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-001-expected.txt.
>+        * web-platform-tests/css/cssom/medialist-interfaces-001.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-001.html.
>+        * web-platform-tests/css/cssom/medialist-interfaces-002-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-002-expected.txt.
>+        * web-platform-tests/css/cssom/medialist-interfaces-002.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-002.html.
>+        * web-platform-tests/css/cssom/medialist-interfaces-003-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-003-expected.txt.
>+        * web-platform-tests/css/cssom/medialist-interfaces-003.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-003.html.
>+        * web-platform-tests/css/cssom/medialist-interfaces-004-expected.txt: Added.
>+        * web-platform-tests/css/cssom/medialist-interfaces-004.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-004.html.
>+        * web-platform-tests/css/cssom/overflow-serialization-expected.txt: Added.
>+        * web-platform-tests/css/cssom/overflow-serialization.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/overflow-serialization.html.
>+        * web-platform-tests/css/cssom/preferred-stylesheet-order-expected.txt: Added.
>+        * web-platform-tests/css/cssom/preferred-stylesheet-order.html: Added.
>+        * web-platform-tests/css/cssom/preferred-stylesheet-reversed-order-expected.txt: Added.
>+        * web-platform-tests/css/cssom/preferred-stylesheet-reversed-order.html: Added.
>+        * web-platform-tests/css/cssom/selectorSerialize-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/selectorSerialize-expected.txt.
>+        * web-platform-tests/css/cssom/selectorSerialize.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/selectorSerialize.html.
>+        * web-platform-tests/css/cssom/selectorText-modification-restyle-001-expected.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/selectorText-modification-restyle-001-expected.html.
>+        * web-platform-tests/css/cssom/selectorText-modification-restyle-001.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/selectorText-modification-restyle-001.html.
>+        * web-platform-tests/css/cssom/selectorText-modification-restyle-002-expected.txt: Added.
>+        * web-platform-tests/css/cssom/selectorText-modification-restyle-002.html: Added.
>+        * web-platform-tests/css/cssom/serialization-CSSDeclaration-with-important-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/serialization-CSSDeclaration-with-important-expected.txt.
>+        * web-platform-tests/css/cssom/serialization-CSSDeclaration-with-important.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/serialization-CSSDeclaration-with-important.html.
>+        * web-platform-tests/css/cssom/serialize-namespaced-type-selectors-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-namespaced-type-selectors-expected.txt.
>+        * web-platform-tests/css/cssom/serialize-namespaced-type-selectors.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-namespaced-type-selectors.html.
>+        * web-platform-tests/css/cssom/serialize-values-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-values-expected.txt.
>+        * web-platform-tests/css/cssom/serialize-values.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-values.html.
>+        * web-platform-tests/css/cssom/serialize-variable-reference-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-variable-reference-expected.txt.
>+        * web-platform-tests/css/cssom/serialize-variable-reference.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-variable-reference.html.
>+        * web-platform-tests/css/cssom/setproperty-null-undefined-expected.txt: Added.
>+        * web-platform-tests/css/cssom/setproperty-null-undefined.html: Added.
>+        * web-platform-tests/css/cssom/shorthand-serialization-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/shorthand-serialization-expected.txt.
>+        * web-platform-tests/css/cssom/shorthand-serialization.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/shorthand-serialization.html.
>+        * web-platform-tests/css/cssom/shorthand-values-expected.txt: Added.
>+        * web-platform-tests/css/cssom/shorthand-values.html: Added.
>+        * web-platform-tests/css/cssom/style-sheet-interfaces-001-expected.txt: Added.
>+        * web-platform-tests/css/cssom/style-sheet-interfaces-001.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-001.html.
>+        * web-platform-tests/css/cssom/style-sheet-interfaces-002-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-002-expected.txt.
>+        * web-platform-tests/css/cssom/style-sheet-interfaces-002.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-002.html.
>+        * web-platform-tests/css/cssom/stylesheet-replacedata-dynamic-expected.html: Added.
>+        * web-platform-tests/css/cssom/stylesheet-replacedata-dynamic.html: Added.
>+        * web-platform-tests/css/cssom/stylesheet-same-origin.css: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.css.
>+        * web-platform-tests/css/cssom/stylesheet-same-origin.sub-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.sub-expected.txt.
>+        * web-platform-tests/css/cssom/stylesheet-same-origin.sub.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.sub.html.
>+        * web-platform-tests/css/cssom/stylesheet-title-expected.txt: Added.
>+        * web-platform-tests/css/cssom/stylesheet-title.html: Added.
>+        * web-platform-tests/css/cssom/support/1x1-green.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-green.png.
>+        * web-platform-tests/css/cssom/support/1x1-lime.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-lime.png.
>+        * web-platform-tests/css/cssom/support/1x1-maroon.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-maroon.png.
>+        * web-platform-tests/css/cssom/support/1x1-navy.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-navy.png.
>+        * web-platform-tests/css/cssom/support/1x1-red.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-red.png.
>+        * web-platform-tests/css/cssom/support/1x1-white.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-white.png.
>+        * web-platform-tests/css/cssom/support/60x60-gg-rr.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/60x60-gg-rr.png.
>+        * web-platform-tests/css/cssom/support/60x60-green.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/60x60-green.png.
>+        * web-platform-tests/css/cssom/support/60x60-red.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/60x60-red.png.
>+        * web-platform-tests/css/cssom/support/README: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/README.
>+        * web-platform-tests/css/cssom/support/a-green.css: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/a-green.css.
>+        * web-platform-tests/css/cssom/support/b-green.css: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/b-green.css.
>+        * web-platform-tests/css/cssom/support/c-red.css: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/c-red.css.
>+        * web-platform-tests/css/cssom/support/cat.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/cat.png.
>+        * web-platform-tests/css/cssom/support/import-charset.css: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/import-charset.css.
>+        * web-platform-tests/css/cssom/support/import-green.css: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/import-green.css.
>+        * web-platform-tests/css/cssom/support/import-red.css: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/import-red.css.
>+        * web-platform-tests/css/cssom/support/pattern-grg-rgr-grg.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/pattern-grg-rgr-grg.png.
>+        * web-platform-tests/css/cssom/support/pattern-grg-rrg-rgg.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/pattern-grg-rrg-rgg.png.
>+        * web-platform-tests/css/cssom/support/pattern-rgr-grg-rgr.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/pattern-rgr-grg-rgr.png.
>+        * web-platform-tests/css/cssom/support/pattern-tr.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/pattern-tr.png.
>+        * web-platform-tests/css/cssom/support/ruler-h-50%.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/ruler-h-50%.png.
>+        * web-platform-tests/css/cssom/support/ruler-h-50px.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/ruler-h-50px.png.
>+        * web-platform-tests/css/cssom/support/ruler-v-100px.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/ruler-v-100px.png.
>+        * web-platform-tests/css/cssom/support/ruler-v-50px.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/ruler-v-50px.png.
>+        * web-platform-tests/css/cssom/support/square-purple.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/square-purple.png.
>+        * web-platform-tests/css/cssom/support/square-teal.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/square-teal.png.
>+        * web-platform-tests/css/cssom/support/square-white.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/square-white.png.
>+        * web-platform-tests/css/cssom/support/support/README: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/support/README.
>+        * web-platform-tests/css/cssom/support/support/swatch-green.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/support/swatch-green.png.
>+        * web-platform-tests/css/cssom/support/support/swatch-red.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/support/swatch-red.png.
>+        * web-platform-tests/css/cssom/support/support/w3c-import.log: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/support/w3c-import.log.
>+        * web-platform-tests/css/cssom/support/swatch-blue.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-blue.png.
>+        * web-platform-tests/css/cssom/support/swatch-green.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-green.png.
>+        * web-platform-tests/css/cssom/support/swatch-lime.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-lime.png.
>+        * web-platform-tests/css/cssom/support/swatch-orange.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-orange.png.
>+        * web-platform-tests/css/cssom/support/swatch-red.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-red.png.
>+        * web-platform-tests/css/cssom/support/swatch-teal.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-teal.png.
>+        * web-platform-tests/css/cssom/support/swatch-white.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-white.png.
>+        * web-platform-tests/css/cssom/support/swatch-yellow.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-yellow.png.
>+        * web-platform-tests/css/cssom/support/test-bl.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-bl.png.
>+        * web-platform-tests/css/cssom/support/test-br.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-br.png.
>+        * web-platform-tests/css/cssom/support/test-inner-half-size.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-inner-half-size.png.
>+        * web-platform-tests/css/cssom/support/test-outer.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-outer.png.
>+        * web-platform-tests/css/cssom/support/test-tl.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-tl.png.
>+        * web-platform-tests/css/cssom/support/test-tr.png: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-tr.png.
>+        * web-platform-tests/css/cssom/support/w3c-import.log: Added.
>+        * web-platform-tests/css/cssom/support/xmlss-pi.xhtml: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/support/xmlss-pi.xhtml.
>+        * web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-count-expected.txt.
>+        * web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-count.html.
>+        * web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-tree-order-expected.txt.
>+        * web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-tree-order.html.
>+        * web-platform-tests/css/cssom/ttwf-cssom-document-extension-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-document-extension-expected.txt.
>+        * web-platform-tests/css/cssom/ttwf-cssom-document-extension.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-document-extension.html.
>+        * web-platform-tests/css/cssom/variable-names-expected.txt: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/variable-names-expected.txt.
>+        * web-platform-tests/css/cssom/variable-names.html: Renamed from LayoutTests/imported/w3c/web-platform-tests/cssom/variable-names.html.
>+        * web-platform-tests/css/cssom/w3c-import.log: Added.
>+        * web-platform-tests/cssom/GetBoundingRect-expected.txt: Removed.
>+        * web-platform-tests/cssom/GetBoundingRect.html: Removed.
>+        * web-platform-tests/cssom/MediaList-expected.txt: Removed.
>+        * web-platform-tests/cssom/cssimportrule-expected.txt: Removed.
>+        * web-platform-tests/cssom/cssom-fontfacerule-expected.txt: Removed.
>+        * web-platform-tests/cssom/index-001-expected.txt: Removed.
>+        * web-platform-tests/cssom/index-001.html: Removed.
>+        * web-platform-tests/cssom/index-002-expected.txt: Removed.
>+        * web-platform-tests/cssom/index-002.html: Removed.
>+        * web-platform-tests/cssom/inline-style-001-expected.txt: Removed.
>+        * web-platform-tests/cssom/interfaces-expected.txt: Removed.
>+        * web-platform-tests/cssom/medialist-interfaces-004-expected.txt: Removed.
>+        * web-platform-tests/cssom/overflow-serialization-expected.txt: Removed.
>+        * web-platform-tests/cssom/style-sheet-interfaces-001-expected.txt: Removed.
>+        * web-platform-tests/cssom/support/w3c-import.log: Removed.
>+        * web-platform-tests/cssom/w3c-import.log: Removed.
>+
> 2018-05-18  Rob Buis  <rbuis@igalia.com>
> 
>         Cannot unset transition with important
>         https://bugs.webkit.org/show_bug.cgi?id=177684
> 
>         Reviewed by Chris Dumez.
> 
>         Import manually the updated test and result.
>diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
>index 84cc00f7c0f3b253172e34170b7725cae5ececc4..87c8c10cde4af9d149e7aefcbac087f617daf1a9 100644
>--- a/LayoutTests/TestExpectations
>+++ b/LayoutTests/TestExpectations
>@@ -302,17 +302,17 @@ webkit.org/b/145566 imported/w3c/web-platform-tests/css/css-grid/alignment/self-
> webkit.org/b/145566 imported/w3c/web-platform-tests/css/css-grid/alignment/self-baseline/grid-self-baseline-changes-grid-area-size-008.html [ ImageOnlyFailure ]
> webkit.org/b/145566 imported/w3c/web-platform-tests/css/css-grid/alignment/self-baseline/grid-self-baseline-changes-grid-area-size-009.html [ ImageOnlyFailure ]
> webkit.org/b/145566 imported/w3c/web-platform-tests/css/css-grid/alignment/self-baseline/grid-self-baseline-changes-grid-area-size-010.html [ ImageOnlyFailure ]
> webkit.org/b/145566 imported/w3c/web-platform-tests/css/css-grid/alignment/self-baseline/grid-self-baseline-changes-grid-area-size-011.html [ ImageOnlyFailure ]
> webkit.org/b/145566 imported/w3c/web-platform-tests/css/css-grid/alignment/self-baseline/grid-self-baseline-changes-grid-area-size-012.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/IndexedDB/nested-cloning-large-multiple.html [ Skip ]
> imported/w3c/web-platform-tests/IndexedDB/nested-cloning-large.html [ Skip ]
> imported/w3c/web-platform-tests/IndexedDB/nested-cloning-small.html [ Skip ]
>-imported/w3c/web-platform-tests/cssom/interfaces.html [ Pass Timeout ]
>+imported/w3c/web-platform-tests/css/cssom/interfaces.html [ Pass Timeout ]
> imported/w3c/web-platform-tests/cssom-view/interfaces.html [ Pass Timeout ]
> webkit.org/b/182292 imported/w3c/web-platform-tests/cssom-view/scrollingElement-quirks-dynamic-001.html [ ImageOnlyFailure ]
> webkit.org/b/182292 imported/w3c/web-platform-tests/cssom-view/scrollingElement-quirks-dynamic-002.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-ui/text-overflow-010.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-ui/text-overflow-012.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-ui/text-overflow-015.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-ui/text-overflow-017.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-ui/text-overflow-021.html [ ImageOnlyFailure ]
>diff --git a/LayoutTests/imported/w3c/resources/import-expectations.json b/LayoutTests/imported/w3c/resources/import-expectations.json
>index 56fe4f68beadcd08e9f69fea60081e01b37deddc..ed3d34baf28f5e6f14f6969dc0cba9de1cf7820c 100644
>--- a/LayoutTests/imported/w3c/resources/import-expectations.json
>+++ b/LayoutTests/imported/w3c/resources/import-expectations.json
>@@ -65,25 +65,24 @@
>     "web-platform-tests/css/css-grid": "import", 
>     "web-platform-tests/css/css-grid/grid-definition/": "import", 
>     "web-platform-tests/css/css-multicol": "import", 
>     "web-platform-tests/css/css-pseudo": "import", 
>     "web-platform-tests/css/css-scoping": "import", 
>     "web-platform-tests/css/css-shapes": "import", 
>     "web-platform-tests/css/css-shapes/test-plan/index.html": "skip", 
>     "web-platform-tests/css/css-ui": "import", 
>+    "web-platform-tests/css/cssom": "import", 
>     "web-platform-tests/css/geometry/": "import", 
>     "web-platform-tests/css/mediaqueries": "import", 
>     "web-platform-tests/css/reference": "import", 
>     "web-platform-tests/css/resources": "import", 
>     "web-platform-tests/css/selectors": "import", 
>     "web-platform-tests/css/support": "import", 
>-    "web-platform-tests/cssom": "import", 
>     "web-platform-tests/cssom-view": "import", 
>-    "web-platform-tests/cssom/MediaList.xhtml": "skip", 
>     "web-platform-tests/custom-elements": "import", 
>     "web-platform-tests/custom-elements/v0": "skip", 
>     "web-platform-tests/dom": "import", 
>     "web-platform-tests/dom/nodes/Document-createElement-namespace-tests/empty.html": "skip", 
>     "web-platform-tests/dom/nodes/Document-createElement-namespace-tests/empty.svg": "skip", 
>     "web-platform-tests/dom/nodes/Document-createElement-namespace-tests/empty.xhtml": "skip", 
>     "web-platform-tests/dom/nodes/Document-createElement-namespace-tests/empty.xml": "skip", 
>     "web-platform-tests/dom/nodes/Document-createProcessingInstruction.xhtml": "skip", 
>@@ -336,9 +335,9 @@
>     "web-platform-tests/websockets": "skip", 
>     "web-platform-tests/webstorage": "skip", 
>     "web-platform-tests/webusb": "skip", 
>     "web-platform-tests/webvr": "skip", 
>     "web-platform-tests/webvtt": "skip", 
>     "web-platform-tests/workers": "import", 
>     "web-platform-tests/worklets": "skip", 
>     "web-platform-tests/x-frame-options": "skip"
>-}
>\ No newline at end of file
>+}
>diff --git a/LayoutTests/imported/w3c/resources/resource-files.json b/LayoutTests/imported/w3c/resources/resource-files.json
>index dd92936474b367b20793e1ce82e7ad04746eae98..2325efe8820b8486a26dbbff9f58c4867ddbd55b 100644
>--- a/LayoutTests/imported/w3c/resources/resource-files.json
>+++ b/LayoutTests/imported/w3c/resources/resource-files.json
>@@ -273,16 +273,17 @@
>         "web-platform-tests/css/css-ui/support/nav-right-013-frame.html",
>         "web-platform-tests/css/css-ui/support/nav-up-009-frame.html",
>         "web-platform-tests/css/css-ui/support/nav-up-010-frame.html",
>         "web-platform-tests/css/css-ui/support/nav-up-011-frame.html",
>         "web-platform-tests/css/css-ui/support/nav-up-012-frame.html",
>         "web-platform-tests/css/css-ui/support/nav-up-013-frame.html",
>         "web-platform-tests/css/css-ui/text-overflow-018.html",
>         "web-platform-tests/css/css-ui/text-overflow-019.html",
>+        "web-platform-tests/css/cssom/support/xmlss-pi.xhtml",
>         "web-platform-tests/css/mediaqueries/support/media_queries_iframe.html",
>         "web-platform-tests/css/mediaqueries/support/min-width-tables-001-iframe.html",
>         "web-platform-tests/cssom-view/iframe.html",
>         "web-platform-tests/cssom/support/xmlss-pi.xhtml",
>         "web-platform-tests/dom/events/EventListener-incumbent-global-subframe-1.sub.html",
>         "web-platform-tests/dom/events/EventListener-incumbent-global-subframe-2.sub.html",
>         "web-platform-tests/dom/events/EventListener-incumbent-global-subsubframe.sub.html",
>         "web-platform-tests/dom/nodes/Element-getElementsByTagName-change-document-HTMLNess-iframe.xml",
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSS-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSS-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..3bafa7b190130e6f54b820f3078bd06e8f135f7a
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSS-expected.txt
>@@ -0,0 +1,5 @@
>+
>+PASS CSS.escape 
>+PASS CSS.supports, one argument form 
>+FAIL CSS.supports, two argument form assert_equals: CSS.supports: two argument form succeeds for custom property expected true but got false
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSS.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSS.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..654629bb3286390c468110c1d0036e6f88ee4d42
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSS.html
>@@ -0,0 +1,38 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>CSSOM - CSS interface</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#the-css.escape()-method">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<script>
>+    test(function () {
>+        // https://drafts.csswg.org/cssom/#dom-css-escape
>+        // https://drafts.csswg.org/cssom/#serialize-an-identifier
>+        assert_equals(CSS.escape("hello world"), "hello\\ world", "CSS.escape: spaces get escaped with backslashes");
>+        assert_equals(CSS.escape("hello\0world"), "hello\u{FFFD}world", "CSS.escape: NULL get replaced with U+FFFD REPLACEMENT CHARACTER");
>+        assert_equals(CSS.escape("hello0world"), "hello0world", "CSS.escape: Numbers within string preserved");
>+        assert_equals(CSS.escape("hello\x10world"), "hello\\10 world", "CSS.escape: Values between \\x01 and \\x1f are unicode escaped");
>+        assert_equals(CSS.escape("hello\\world"), "hello\\\\world", "CSS.escape: Backslashes get backslash-escaped");
>+        assert_equals(CSS.escape("hello\u{1234}world"), "hello\u{1234}world", "CSS.escape: Code points greater than U+0080 are preserved");
>+        assert_equals(CSS.escape("hello\x7Fworld"), "hello\\7f world", "CSS.escape: Some code points less than U+0080 are unicode-escaped");
>+        assert_equals(CSS.escape("-"), "\\-", "CSS.escape: Single dash escaped");
>+        assert_equals(CSS.escape("0foo"), "\\30 foo", "CSS.escape: Numbers at the beginning of an ident get unicode escaped");
>+        assert_equals(CSS.escape("-0foo"), "-\\30 foo", "CSS.escape: Numbers at the beginning of an ident after single hyphen get unicode escaped");
>+        assert_equals(CSS.escape("--0foo"), "--0foo", "CSS.escape: Numbers at the beginning of an ident after multiple hyphens do not get unicode escaped");
>+    }, "CSS.escape");
>+    test(function () {
>+        // https://drafts.csswg.org/css-conditional/#dom-css-supports
>+        // https://drafts.csswg.org/css-conditional/#typedef-supports-condition
>+        assert_equals(CSS.supports("color: red"), true, "CSS.supports: Single-argument form allows for declarations without enclosing parentheses");
>+        assert_equals(CSS.supports("(color: red) and (color: blue)"), true, "CSS.supports: Complex conditions allowed");
>+        assert_equals(CSS.supports("not (foobar)"), true, "CSS.supports: general_enclosed still parses");
>+    }, "CSS.supports, one argument form");
>+    test(function () {
>+        // https://drafts.csswg.org/css-conditional/#dom-css-supports
>+        // https://drafts.csswg.org/css-conditional/#dfn-support
>+        assert_equals(CSS.supports("color", "red"), true, "CSS.supports: two argument form succeeds for known property");
>+        assert_equals(CSS.supports("unknownproperty", "blah"), false, "CSS.supports: two argument form fails for unknown property");
>+        assert_equals(CSS.supports("width", "blah"), false, "CSS.supports: two argument form fails for invalid value");
>+        assert_equals(CSS.supports("--foo", "blah"), true, "CSS.supports: two argument form succeeds for custom property");
>+    }, "CSS.supports, two argument form");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframeRule-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframeRule-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..cbeab2be49c6ce70e5e15f342959d9bd6b009dce
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframeRule-expected.txt
>@@ -0,0 +1,4 @@
>+
>+PASS CSSKeyframeRule: style property 
>+PASS CSSKeyframeRule: style property has [PutForwards] 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframeRule.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframeRule.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..148df18b8f88b91b782c7e694e55166046b23525
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframeRule.html
>@@ -0,0 +1,52 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title></title>
>+<link rel="help" href="https://drafts.csswg.org/css-animations/#interface-csskeyframerule">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<style type="text/css" id="styleElement">
>+  div { animation: 3s slidein; }
>+  @keyframes slidein {
>+    from {
>+      margin-left: 100%;
>+      width: 300%;
>+    }
>+
>+    to {
>+      margin-left: 0%;
>+      width: 100%;
>+    }
>+  }
>+</style>
>+<script>
>+  var styleSheet = document.getElementById("styleElement").sheet;
>+  var keyframesRule = styleSheet.cssRules[1];
>+  var fromRule = keyframesRule.cssRules[0];
>+  var toRule = keyframesRule.cssRules[1];
>+
>+  test(function() {
>+    assert_equals(keyframesRule.name, "slidein");
>+    assert_equals(typeof fromRule.style, "object");
>+    assert_equals(fromRule.style.marginLeft, "100%");
>+    assert_equals(fromRule.style.width, "300%");
>+
>+    assert_equals(typeof toRule.style, "object");
>+    assert_equals(toRule.style.marginLeft, "0%");
>+    assert_equals(toRule.style.width, "100%");
>+
>+    toRule.style.marginLeft = "-5%";
>+    toRule.style.width = "50%";
>+
>+    assert_equals(fromRule.style.marginLeft, "100%");
>+    assert_equals(fromRule.style.width, "300%");
>+    assert_equals(toRule.style.marginLeft, "-5%");
>+    assert_equals(toRule.style.width, "50%");
>+  }, "CSSKeyframeRule: style property");
>+
>+  test(function() {
>+    fromRule.style = "margin-left: 50%; width: 100%;";
>+
>+    assert_equals(fromRule.style.marginLeft, "50%", "margin-left");
>+    assert_equals(fromRule.style.width, "100%", "width");
>+  }, "CSSKeyframeRule: style property has [PutForwards]");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframesRule-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframesRule-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..7f1e99ed4557574a5cfc200f6021fdbdc8d33d8a
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframesRule-expected.txt
>@@ -0,0 +1,3 @@
>+
>+FAIL CSSOM -  CSSKeyframesRule interface assert_equals: CSSKeyframesRule cssText attribute expected "@keyframesbar{}" but got "@-webkit-keyframesbar{}"
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframesRule.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframesRule.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..4b4b1f054542308124a0e4023137023c8ca5fc99
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframesRule.html
>@@ -0,0 +1,74 @@
>+<!doctype html>
>+<html>
>+<head>
>+    <meta charset="utf-8">
>+    <title>CSSOM -  CSSKeyframesRule interface</title>
>+    <link rel="help" href="https://drafts.csswg.org/css-animations/#interface-csskeyframesrule">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+    <style>
>+        @keyframes foo {
>+            0% { top: 0px; }
>+            100% { top: 200px; }
>+        }
>+        @keyframes empty {}
>+    </style>
>+
>+    <script>
>+    test(function () {
>+        var keyframe = document.styleSheets[0].cssRules[0];
>+        assert_equals(keyframe.name, "foo", "CSSKeyframesRule name attribute");
>+        assert_equals(keyframe.cssRules.length, 2, "CSSKeyframesRule cssRule length attribute");
>+        assert_equals(keyframe.cssRules[0].cssText, "0% { top: 0px; }", "CSSKeyframesRule cssRule cssText attribute");
>+        assert_equals(keyframe.cssRules[1].cssText, "100% { top: 200px; }", "CSSKeyframesRule cssRule cssText attribute");
>+
>+        keyframe.appendRule("50% { top: 100px; }");
>+        assert_equals(keyframe.cssRules.length, 3, "CSSKeyframesRule cssRule length attribute after appendRule function");
>+        assert_equals(keyframe.cssRules[0].cssText, "0% { top: 0px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>+        assert_equals(keyframe.cssRules[1].cssText, "100% { top: 200px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>+        assert_equals(keyframe.cssRules[2].cssText, "50% { top: 100px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>+
>+        keyframe.appendRule("0% { top: 50px; }");
>+        assert_equals(keyframe.cssRules.length, 4, "CSSKeyframesRule cssRule length attribute after appendRule function");
>+        assert_equals(keyframe.cssRules[0].cssText, "0% { top: 0px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>+        assert_equals(keyframe.cssRules[1].cssText, "100% { top: 200px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>+        assert_equals(keyframe.cssRules[2].cssText, "50% { top: 100px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>+        assert_equals(keyframe.cssRules[3].cssText, "0% { top: 50px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>+
>+        var find1 = keyframe.findRule("50%");
>+        assert_equals(find1.cssText, "50% { top: 100px; }", "CSSKeyframesRule findRule function");
>+        var find2 = keyframe.findRule("0%");
>+        assert_equals(find2.cssText, "0% { top: 50px; }", "CSSKeyframesRule findRule function");
>+        var find3 = keyframe.findRule("70%");
>+        assert_equals(find3, null, "CSSKeyframesRule findRule function");
>+
>+        keyframe.deleteRule("100%");
>+        assert_equals(keyframe.cssRules.length, 3, "CSSKeyframesRule cssRule length attribute after deleteRule function");
>+        assert_equals(keyframe.cssRules[0].cssText, "0% { top: 0px; }", "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>+        assert_equals(keyframe.cssRules[1].cssText, "50% { top: 100px; }", "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>+        assert_equals(keyframe.cssRules[2].cssText, "0% { top: 50px; }", "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>+        assert_equals(keyframe.cssRules[3], undefined, "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>+
>+        keyframe.deleteRule("80%");
>+        assert_equals(keyframe.cssRules.length, 3, "CSSKeyframesRule cssRule length attribute after deleteRule function");
>+        assert_equals(keyframe.cssRules[0].cssText, "0% { top: 0px; }", "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>+        assert_equals(keyframe.cssRules[1].cssText, "50% { top: 100px; }", "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>+        assert_equals(keyframe.cssRules[2].cssText, "0% { top: 50px; }", "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>+        assert_equals(keyframe.cssRules[3], undefined, "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>+
>+        var empty = document.styleSheets[0].cssRules[1];
>+        empty.name = "bar";
>+        assert_equals(empty.name, "bar", "CSSKeyframesRule name setter");
>+        assert_equals(empty.cssText.replace(/\s/g, ""), "@keyframesbar{}", "CSSKeyframesRule cssText attribute");
>+
>+        empty.name = "initial";
>+        assert_equals(empty.name, "initial", "CSSKeyframesRule name setter, CSS-wide keyword");
>+        assert_equals(empty.cssText.replace(/\s/g, ""), "@keyframes\"initial\"{}", "CSSKeyframesRule cssText attribute with CSS-wide keyword name");
>+
>+        empty.name = "none";
>+        assert_equals(empty.name, "none", "CSSKeyframesRule name setter, 'none'");
>+        assert_equals(empty.cssText.replace(/\s/g, ""), "@keyframes\"none\"{}", "CSSKeyframesRule cssText attribute with 'none' name");
>+    });
>+    </script>
>+</head>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSNamespaceRule-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSNamespaceRule-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..2b892a2e4492375ef77f9e366e4fe80f451a9929
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSNamespaceRule-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS CSSOM - CSSNamespaceRule interface 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSNamespaceRule.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSNamespaceRule.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..632cf6f88cd8ad48cb5fcf60bed150458bf34ebb
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSNamespaceRule.html
>@@ -0,0 +1,32 @@
>+<!doctype html>
>+<html>
>+<head>
>+    <meta charset="utf-8">
>+    <title>CSSOM - CSSNamespaceRule interface</title>
>+    <link rel="help" href="https://drafts.csswg.org/cssom/#the-cssnamespacerule-interface">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+    <style>
>+        @namespace svg url(http://servo);
>+        @namespace url(http://servo1);
>+        @namespace svg url("http://servo2");
>+    </style>
>+
>+    <script>
>+    test(function () {
>+        var rules = document.styleSheets[0].cssRules;
>+        assert_equals(rules[0].prefix, "svg", "CSSNamespaceRule prefix attribute");
>+        assert_equals(rules[0].namespaceURI, "http://servo", "CSSNamespaceRule namespaceURI attribute");
>+        assert_equals(rules[0].cssText, "@namespace svg url(\"http://servo\");", "CSSNamespaceRule cssText attribute");
>+
>+        assert_equals(rules[1].prefix, "", "CSSNamespaceRule prefix attribute");
>+        assert_equals(rules[1].namespaceURI, "http://servo1", "CSSNamespaceRule namespaceURI attribute");
>+        assert_equals(rules[1].cssText, "@namespace url(\"http://servo1\");", "CSSNamespaceRule cssText attribute");
>+
>+        assert_equals(rules[2].prefix, "svg", "CSSNamespaceRule prefix attribute");
>+        assert_equals(rules[2].namespaceURI, "http://servo2", "CSSNamespaceRule namespaceURI attribute");
>+        assert_equals(rules[2].cssText, "@namespace svg url(\"http://servo2\");", "CSSNamespaceRule cssText attribute");
>+    });
>+    </script>
>+</head>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSRuleList-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSRuleList-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..0709a8c09d146be4108dcc77e2b7e39d92cdb0b3
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSRuleList-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS CSSOM - CSSRuleList interface 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSRuleList.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSRuleList.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..e8f53a2d92d9ea34d8248f457157f96649c5141d
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSRuleList.html
>@@ -0,0 +1,27 @@
>+<!doctype html>
>+<html>
>+<head>
>+    <meta charset="utf-8">
>+    <title>CSSOM - CSSRuleList interface</title>
>+    <link rel="help" href="https://drafts.csswg.org/cssom/#the-cssrulelist-interface">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+    <style>
>+        body { width: 50%; }
>+        #foo { height: 100px; }
>+    </style>
>+
>+    <script>
>+    test(function () {
>+        var ruleList = document.styleSheets[0].cssRules;
>+        assert_equals(ruleList.length, 2, "CSSRuleList length attribute");
>+        assert_equals(ruleList[0].cssText, "body { width: 50%; }", "CSSRuleList indexed getter");
>+        assert_equals(ruleList[1].cssText, "#foo { height: 100px; }", "CSSRuleList indexed getter");
>+        assert_equals(ruleList[2], undefined, "CSSRuleList indexed getter");
>+        assert_equals(ruleList.item(0).cssText, "body { width: 50%; }", "CSSRuleList item function");
>+        assert_equals(ruleList.item(1).cssText, "#foo { height: 100px; }", "CSSRuleList item function");
>+        assert_equals(ruleList.item(2), null, "CSSRuleList item function");
>+    });
>+    </script>
>+</head>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..3cb92f443a5b1e49ad6a4f11e009c2a78bc08ed0
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-expected.txt
>@@ -0,0 +1,12 @@
>+
>+PASS CSSRule and CSSStyleRule types 
>+PASS Type of CSSRule#type and constant values 
>+PASS Existence of CSSRule attributes 
>+PASS Writability of CSSRule attributes 
>+PASS Values of CSSRule attributes 
>+PASS Existence and type of CSSStyleRule attributes 
>+PASS Assigning to CSSStyleRule.style assigns to cssText; CSSStyleRule.style returns the same object 
>+PASS Values of CSSStyleRule attributes 
>+PASS Mutability of CSSStyleRule's style attribute 
>+PASS CSSStyleRule's style has [PutForwards] 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..8ec4b6a3e5f2d8f67e0542eebdfe10acc526c5ae
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-expected.txt
>@@ -0,0 +1,84 @@
>+
>+PASS CSSStyleRule: Can read selectorText value. 
>+PASS CSSStyleRule: Invalid CSS selector:  
>+PASS CSSStyleRule: Invalid CSS selector:   
>+PASS CSSStyleRule: Invalid CSS selector: !! 
>+PASS CSSStyleRule: Invalid CSS selector: 123 
>+PASS CSSStyleRule: Invalid CSS selector: - 
>+PASS CSSStyleRule: Invalid CSS selector: $ 
>+PASS CSSStyleRule: Invalid CSS selector: : 
>+PASS CSSStyleRule: Invalid CSS selector: :: 
>+PASS CSSStyleRule: Invalid CSS selector: ::: 
>+PASS CSSStyleRule: Invalid CSS selector: ::gibberish 
>+PASS CSSStyleRule: Invalid CSS selector: :gibberish 
>+PASS CSSStyleRule: Invalid CSS selector: . 
>+PASS CSSStyleRule: Invalid CSS selector: # 
>+PASS CSSStyleRule: Invalid CSS selector: [] 
>+PASS CSSStyleRule: Invalid CSS selector: [ 
>+PASS CSSStyleRule: Invalid CSS selector: () 
>+PASS CSSStyleRule: Invalid CSS selector: ( 
>+PASS CSSStyleRule: Invalid CSS selector: {} 
>+PASS CSSStyleRule: Invalid CSS selector: { 
>+PASS CSSStyleRule: selectorText value: |#container| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |#container  | isMatch: true 
>+PASS CSSStyleRule: selectorText value: |  #container | isMatch: true 
>+PASS CSSStyleRule: selectorText value: |.style1| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |div.style1| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |div:not(#non-existing-id)| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |div| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |*| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |#no-match| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |ÃÄÄ±Ä°| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |ð¤| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |[language]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[language-no]| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |[lang="zh-CN"]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[lang="ab-CD"]| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |[segment~="43"]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[segment~="42"]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[lang|="zh"]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[lang|="zh-CN"]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[lang|="ab"]| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |[lang|="z"]| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |[lang^="z"]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[lang^="ab"]| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |[segment$="43"]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[segment$="3"]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[segment$="42"]| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |[lang*="-"]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[lang*="h-"]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[lang*="ab"]| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |*|div| isMatch: true 
>+PASS CSSStyleRule: selectorText value: ||div| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |*|a| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |*|*| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[*|lang]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |[|lang]| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |:active| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |:not(:active)| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |*:not(:active)| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |div:not(:active)| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |div:active| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |span div| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |span  div  | isMatch: true 
>+PASS CSSStyleRule: selectorText value: |span > div| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |div div| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |div > div| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |p + div| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |span + div| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |p ~ div| isMatch: true 
>+PASS CSSStyleRule: selectorText value: |span ~ div| isMatch: false 
>+FAIL CSSStyleRule: selectorText value: |:lang(zh-CN)| isMatch: true assert_equals: expected ":lang(zh-CN)" but got ":lang(\"zh-CN\")"
>+FAIL CSSStyleRule: selectorText value: |:lang(zh)| isMatch: true assert_equals: expected ":lang(zh)" but got ":lang(\"zh\")"
>+FAIL CSSStyleRule: selectorText value: |:lang(tr-AZ)| isMatch: false assert_equals: expected ":lang(tr-AZ)" but got ":lang(\"tr-AZ\")"
>+PASS CSSStyleRule: selectorText value: |::after| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |:after| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |::before| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |:before| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |::first-letter| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |:first-letter| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |::first-line| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |:first-line| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |div:focus:not([lang="zh-CN"])| isMatch: false 
>+PASS CSSStyleRule: selectorText value: |div[lang="zh-CN"]:not(:focus)| isMatch: true 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-namespace-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-namespace-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..34e0df783d6d59d2f60314919816126416ce27ae
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-namespace-expected.txt
>@@ -0,0 +1,8 @@
>+SVG text
>+
>+FAIL CSSStyleRule: selectorText value: |.style1| isMatch: false assert_equals: expected "rgb(255, 0, 255)" but got "rgb(0, 0, 255)"
>+FAIL CSSStyleRule: selectorText value: |svg|*.style1  | isMatch: true assert_equals: expected "svg|*.style0" but got ".style1"
>+FAIL CSSStyleRule: selectorText value: |*|*.style1  | isMatch: true assert_equals: expected "svg|*.style0" but got ".style1"
>+FAIL CSSStyleRule: selectorText value: | *.style1  | isMatch: false assert_equals: expected "svg|*.style0" but got ".style1"
>+FAIL CSSStyleRule: selectorText value: |p| isMatch: false assert_equals: expected "svg|*.style0" but got ".style1"
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-namespace.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-namespace.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..73136947ba614a1510d440ec382e87b2b171ab0b
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-namespace.html
>@@ -0,0 +1,60 @@
>+<!DOCTYPE html>
>+<meta charset=utf-8>
>+<title>CSSOM StyleRule selectorText property setter with namespaces</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom-1/#dom-cssstylerule-selectortext">
>+<script src=../../../../../resources/testharness.js></script>
>+<script src=../../../../../resources/testharnessreport.js></script>
>+
>+<style type="text/css" id="styleElement">
>+@namespace url(http://www.w3.org/1999/xhtml);
>+@namespace svg url(http://www.w3.org/2000/svg);
>+
>+svg|*.style0 { background-color: rgb(0, 0, 255) !important; }
>+svg|*.style1 { background-color: rgb(255, 0, 255); }
>+</style>
>+
>+<span>
>+  <p></p>
>+
>+  <svg height="30" width="200" id="container" class="style1" lang="zh-CN" language segment="42 43">
>+    <text x="0" y="15">SVG text</text>
>+  </svg>
>+</span>
>+
>+<script>
>+  var styleSheet = document.getElementById("styleElement").sheet;
>+  var rule = styleSheet.cssRules[2];
>+
>+  var divContainerStyle = getComputedStyle(document.getElementById("container"));
>+
>+  const originalStyleSelector = "svg|*.style0";
>+
>+  var assertColors = function(selectorMatches) {
>+    assert_equals(divContainerStyle.getPropertyValue('background-color'), selectorMatches ? "rgb(0, 0, 255)" : "rgb(255, 0, 255)")
>+  };
>+
>+  [
>+    {selector: ".style1", isMatch: false, },
>+    {selector: "svg|*.style1  ", isMatch: true, normalizedSelector: "svg|*.style1"},
>+    {selector: "*|*.style1  ", isMatch: true, normalizedSelector: "*|*.style1"},
>+    {selector: " *.style1  ", isMatch: false, normalizedSelector: ".style1"},
>+    {selector: "p", isMatch: false},
>+  ].forEach(function(testCase) {
>+    test(function() {
>+      // Check if starting with the default value.
>+      assert_equals(rule.selectorText, originalStyleSelector);
>+
>+      this.add_cleanup(function() { rule.selectorText = originalStyleSelector; });
>+
>+      assertColors(false);
>+
>+      rule.selectorText = testCase.selector;
>+
>+      var expectedSelector = testCase.normalizedSelector ? testCase.normalizedSelector : testCase.selector;
>+
>+      assert_equals(rule.selectorText, expectedSelector);
>+
>+      assertColors(testCase.isMatch);
>+    }, "CSSStyleRule: selectorText value: |" + testCase.selector + "| isMatch: " + testCase.isMatch);
>+  });
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..e3feb0046833fc09dbbb5f03f92be6a7da06c483
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText.html
>@@ -0,0 +1,158 @@
>+<!DOCTYPE html>
>+<meta charset=utf-8>
>+<title>CSSOM StyleRule selectorText property setter</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom-1/#dom-cssstylerule-selectortext">
>+<script src=../../../../../resources/testharness.js></script>
>+<script src=../../../../../resources/testharnessreport.js></script>
>+
>+<style type="text/css" id="styleElement">
>+  .style0 { background-color: rgb(0, 0, 255) !important; }
>+  .style1 { background-color: rgb(255, 0, 255); }
>+</style>
>+
>+<span>
>+  <p></p>
>+  <div id="container" class="style1" lang="zh-CN" language segment="42 43">
>+  </div>
>+</span>
>+
>+<script>
>+  var styleSheet = document.getElementById("styleElement").sheet;
>+  var rule = styleSheet.cssRules[0];
>+
>+  var divContainerStyle = getComputedStyle(document.getElementById("container"));
>+
>+  const originalStyleSelector = ".style0";
>+
>+  var assertColors = function(selectorMatches) {
>+    assert_equals(divContainerStyle.backgroundColor, selectorMatches ? "rgb(0, 0, 255)" : "rgb(255, 0, 255)")
>+  };
>+
>+  test(function() {
>+    assert_equals(typeof rule.selectorText, "string");
>+    assert_equals(rule.selectorText, originalStyleSelector);
>+  }, "CSSStyleRule: Can read selectorText value.");
>+
>+  [ // Invalid selector values.
>+    "",
>+    " ",
>+    "!!",
>+    "123",
>+    "-",
>+    "$",
>+    ":",
>+    "::",
>+    ":::",
>+    "::gibberish",
>+    ":gibberish",
>+    ".",
>+    "#",
>+    "[]",
>+    "[",
>+    "()",
>+    "(",
>+    "{}",
>+    "{",
>+  ].forEach(function(selector) {
>+    test(function() {
>+      assert_equals(rule.selectorText, originalStyleSelector);
>+
>+      this.add_cleanup(function() { rule.selectorText = originalStyleSelector; });
>+
>+      rule.selectorText = selector;
>+
>+      assert_equals(rule.selectorText, originalStyleSelector);
>+    }, "CSSStyleRule: Invalid CSS selector: " + selector);
>+  });
>+
>+
>+  [ // Valid selector values.
>+    {selector: "#container", isMatch: true},
>+    {selector: "#container  ", isMatch: true, normalizedSelector: "#container"},
>+    {selector: "  #container ", isMatch: true, normalizedSelector: "#container"},
>+    {selector: ".style1", isMatch: true},
>+    {selector: "div.style1", isMatch: true},
>+    {selector: "div:not(#non-existing-id)", isMatch: true},
>+    {selector: "div", isMatch: true},
>+    {selector: "*", isMatch: true},
>+
>+    {selector: "#no-match", isMatch: false},
>+    {selector: "ÃÄÄ±Ä°", isMatch: false},
>+    {selector: "ð¤", isMatch: false},
>+
>+    {selector: "[language]", isMatch: true},
>+    {selector: "[language-no]", isMatch: false},
>+    {selector: "[lang=\"zh-CN\"]", isMatch: true},
>+    {selector: "[lang=\"ab-CD\"]", isMatch: false},
>+    {selector: "[segment~=\"43\"]", isMatch: true},
>+    {selector: "[segment~=\"42\"]", isMatch: true},
>+    {selector: "[lang|=\"zh\"]", isMatch: true},
>+    {selector: "[lang|=\"zh-CN\"]", isMatch: true},
>+    {selector: "[lang|=\"ab\"]", isMatch: false},
>+    {selector: "[lang|=\"z\"]", isMatch: false},
>+    {selector: "[lang^=\"z\"]", isMatch: true},
>+    {selector: "[lang^=\"ab\"]", isMatch: false},
>+    {selector: "[segment$=\"43\"]", isMatch: true},
>+    {selector: "[segment$=\"3\"]", isMatch: true},
>+    {selector: "[segment$=\"42\"]", isMatch: false},
>+    {selector: "[lang*=\"-\"]", isMatch: true},
>+    {selector: "[lang*=\"h-\"]", isMatch: true},
>+    {selector: "[lang*=\"ab\"]", isMatch: false},
>+
>+    {selector: "*|div", isMatch: true, normalizedSelector: "div"},
>+    {selector: "|div", isMatch: false},
>+    {selector: "*|a", isMatch: false, normalizedSelector: "a"},
>+    {selector: "*|*", isMatch: true, normalizedSelector: "*"},
>+    {selector: "[*|lang]", isMatch: true, normalizedSelector: "[*|lang]"},
>+    {selector: "[|lang]", isMatch: true, normalizedSelector: "[lang]"},
>+
>+    {selector: ":active", isMatch: false},
>+    {selector: ":not(:active)", isMatch: true},
>+    {selector: "*:not(:active)", isMatch: true, normalizedSelector: ":not(:active)"},
>+    {selector: "div:not(:active)", isMatch: true},
>+    {selector: "div:active", isMatch: false},
>+
>+    {selector: "span div", isMatch: true},
>+    {selector: "span  div  ", isMatch: true, normalizedSelector: "span div"},
>+    {selector: "span > div", isMatch: true},
>+    {selector: "div div", isMatch: false},
>+    {selector: "div > div", isMatch: false},
>+    {selector: "p + div", isMatch: true},
>+    {selector: "span + div", isMatch: false},
>+    {selector: "p ~ div", isMatch: true},
>+    {selector: "span ~ div", isMatch: false},
>+
>+    {selector: ":lang(zh-CN)", isMatch: true},
>+    {selector: ":lang(zh)", isMatch: true},
>+    {selector: ":lang(tr-AZ)", isMatch: false},
>+
>+    {selector: "::after", isMatch: false, normalizedSelector: "::after"},
>+    {selector: ":after", isMatch: false, normalizedSelector: "::after"},
>+    {selector: "::before", isMatch: false, normalizedSelector: "::before"},
>+    {selector: ":before", isMatch: false, normalizedSelector: "::before"},
>+    {selector: "::first-letter", isMatch: false, normalizedSelector: "::first-letter"},
>+    {selector: ":first-letter", isMatch: false, normalizedSelector: "::first-letter"},
>+    {selector: "::first-line", isMatch: false, normalizedSelector: "::first-line"},
>+    {selector: ":first-line", isMatch: false, normalizedSelector: "::first-line"},
>+
>+    {selector: "div:focus:not([lang=\"zh-CN\"])", isMatch: false},
>+    {selector: "div[lang=\"zh-CN\"]:not(:focus)", isMatch: true},
>+  ].forEach(function(testCase) {
>+    test(function() {
>+      // Check if starting with the default value.
>+      assert_equals(rule.selectorText, originalStyleSelector);
>+
>+      this.add_cleanup(function() { rule.selectorText = originalStyleSelector; });
>+
>+      assertColors(false);
>+
>+      rule.selectorText = testCase.selector;
>+
>+      var expectedSelector = testCase.normalizedSelector ? testCase.normalizedSelector : testCase.selector;
>+
>+      assert_equals(rule.selectorText, expectedSelector);
>+
>+      assertColors(testCase.isMatch);
>+    }, "CSSStyleRule: selectorText value: |" + testCase.selector + "| isMatch: " + testCase.isMatch);
>+  });
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..88cfc91ad8c531ce7953f5d63d29bafb4a60c656
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule.html
>@@ -0,0 +1,113 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <title>CSSOM CSSRule CSSStyleRule interface</title>
>+    <link rel="author" title="Letitia Lew" href="mailto:lew.letitia@gmail.com">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-rules">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstylerule-interface">
>+    <meta name="flags" content="dom">
>+    <meta name="assert" content="All properties for this CSSStyleRule instance of CSSRule are initialized correctly">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+
>+    <style id="styleElement" type="text/css">
>+        div { margin: 10px; padding: 0px; }
>+    </style>
>+</head>
>+<body>
>+    <div id="log"></div>
>+
>+    <script type="text/javascript">
>+        var rule;
>+        setup(function() {
>+            var styleSheet = document.getElementById("styleElement").sheet;
>+            var ruleList = styleSheet.cssRules;
>+            rule = ruleList[0];
>+        });
>+
>+        test(function() {
>+            assert_true(rule instanceof CSSRule);
>+            assert_true(rule instanceof CSSStyleRule);
>+        }, "CSSRule and CSSStyleRule types");
>+
>+        test(function() {
>+            assert_equals(rule.STYLE_RULE, 1);
>+            assert_equals(rule.IMPORT_RULE, 3);
>+            assert_equals(rule.MEDIA_RULE, 4);
>+            assert_equals(rule.FONT_FACE_RULE, 5);
>+            assert_equals(rule.PAGE_RULE, 6);
>+            assert_equals(rule.NAMESPACE_RULE, 10);
>+            assert_idl_attribute(rule, "type");
>+            assert_equals(typeof rule.type, "number");
>+        }, "Type of CSSRule#type and constant values");
>+
>+        test(function() {
>+            assert_true(rule instanceof CSSRule);
>+            assert_idl_attribute(rule, "cssText");
>+            assert_idl_attribute(rule, "parentRule");
>+            assert_idl_attribute(rule, "parentStyleSheet");
>+        }, "Existence of CSSRule attributes");
>+
>+        test(function() {
>+            assert_readonly(rule, "type");
>+            assert_readonly(rule, "parentRule");
>+            assert_readonly(rule, "parentStyleSheet");
>+        }, "Writability of CSSRule attributes");
>+
>+        test(function() {
>+            assert_equals(rule.type, rule.STYLE_RULE);
>+            assert_equals(typeof rule.cssText, "string");
>+            assert_equals(rule.cssText, "div { margin: 10px; padding: 0px; }");
>+            assert_equals(rule.parentRule, null);
>+            assert_true(rule.parentStyleSheet instanceof CSSStyleSheet);
>+        }, "Values of CSSRule attributes");
>+
>+        test(function() {
>+            assert_idl_attribute(rule, "selectorText");
>+            assert_equals(typeof rule.selectorText, "string");
>+            assert_idl_attribute(rule, "style");
>+        }, "Existence and type of CSSStyleRule attributes");
>+
>+        test(function() {
>+            // CSSStyleRule.style has PutForwards=cssText and SameObject.
>+            var initial = rule.style.cssText;
>+            var style = rule.style;
>+
>+            rule.style = "";
>+            assert_equals(rule.style.cssText, "");
>+            assert_equals(rule.style, style);
>+
>+            rule.style = "margin: 42px;";
>+            assert_equals(rule.style.margin, "42px");
>+            assert_equals(rule.style, style);
>+
>+            rule.style = initial;
>+            assert_equals(rule.style, style);
>+        }, "Assigning to CSSStyleRule.style assigns to cssText; CSSStyleRule.style returns the same object");
>+
>+        test(function() {
>+            assert_equals(rule.selectorText, "div");
>+            assert_true(rule.style instanceof CSSStyleDeclaration);
>+        }, "Values of CSSStyleRule attributes");
>+
>+        test(function() {
>+            assert_equals(rule.style.margin, "10px");
>+            assert_equals(rule.style.padding, "0px");
>+
>+            rule.style.padding = "5px";
>+            rule.style.border = "1px solid";
>+
>+            assert_equals(rule.style.padding, "5px");
>+            assert_equals(rule.style.border, "1px solid");
>+        }, "Mutability of CSSStyleRule's style attribute");
>+
>+        test(function() {
>+            rule.style = "margin: 15px; padding: 2px;";
>+
>+            assert_equals(rule.style.margin, "15px", "margin");
>+            assert_equals(rule.style.padding, "2px", "padding");
>+        }, "CSSStyleRule's style has [PutForwards]");
>+    </script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleSheet-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleSheet-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..58f3208da61ba697e28c20a7d8846a7d08ce2b38
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleSheet-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS CSSOM - CSSStyleSheet interface 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleSheet.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleSheet.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..d0d454e4bf5938733f354b3ba9d52ed11ac27cc1
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleSheet.html
>@@ -0,0 +1,44 @@
>+<!doctype html>
>+<html>
>+<head>
>+    <meta charset="utf-8">
>+    <title>CSSOM - CSSStyleSheet interface</title>
>+    <link rel="help" href="https://drafts.csswg.org/cssom/#the-cssstylesheet-interface">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+    <style id="my-stylesheet">
>+        body { width: 50%; }
>+        #foo { height: 100px; }
>+    </style>
>+
>+    <script>
>+    test(function () {
>+        var styleSheet = document.styleSheets[0];
>+        styleSheet.cssRules[0].randomProperty = 1;
>+        styleSheet.cssRules[1].randomProperty = 2;
>+
>+        assert_equals(styleSheet, document.getElementById("my-stylesheet").sheet, "CSSStyleSheet and LinkStyle's sheet attribute");
>+        assert_equals(styleSheet.cssRules.length, 2, "CSSStyleSheet cssRules attribute");
>+        assert_equals(styleSheet.cssRules[0].cssText, "body { width: 50%; }", "CSSStyleSheet cssRules attribute");
>+        assert_equals(styleSheet.cssRules[1].cssText, "#foo { height: 100px; }", "CSSStyleSheet cssRules attribute");
>+        assert_equals(styleSheet.cssRules[2], undefined, "CSSStyleSheet cssRules attribute");
>+
>+        styleSheet.insertRule("#bar { margin: 10px; }", 1);
>+        assert_equals(styleSheet.cssRules.length, 3, "CSSStyleSheet cssRules attribute after insertRule function");
>+        assert_equals(styleSheet.cssRules[0].cssText, "body { width: 50%; }", "CSSStyleSheet cssRules attribute");
>+        assert_equals(styleSheet.cssRules[1].cssText, "#bar { margin: 10px; }", "CSSStyleSheet cssRules attribute after insertRule function");
>+        assert_equals(styleSheet.cssRules[2].cssText, "#foo { height: 100px; }", "CSSStyleSheet cssRules attribute after insertRule function");
>+        assert_equals(styleSheet.cssRules[0].randomProperty, 1, "[SameObject] cssRules attribute after insertRule function");
>+        assert_equals(styleSheet.cssRules[2].randomProperty, 2, "[SameObject] cssRules attribute after insertRule function");
>+
>+        styleSheet.deleteRule(1);
>+        assert_equals(styleSheet.cssRules.length, 2, "CSSStyleSheet cssRules attribute after deleteRule function");
>+        assert_equals(styleSheet.cssRules[0].cssText, "body { width: 50%; }", "CSSStyleSheet cssRules attribute after deleteRule function");
>+        assert_equals(styleSheet.cssRules[1].cssText, "#foo { height: 100px; }", "CSSStyleSheet cssRules attribute after deleteRule function");
>+        assert_equals(styleSheet.cssRules[2], undefined, "CSSStyleSheet cssRules attribute after deleteRule function");
>+        assert_equals(styleSheet.cssRules[0].randomProperty, 1, "[SameObject] cssRules attribute after deleteRule function");
>+        assert_equals(styleSheet.cssRules[1].randomProperty, 2, "[SameObject] cssRules attribute after deleteRule function");
>+    });
>+    </script>
>+</head>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..2fddc64cf32a374ad0159e7ee4d2df49a4dc8e28
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList-expected.txt
>@@ -0,0 +1,3 @@
>+
>+FAIL CSSOM - MediaList interface assert_equals: MediaList toString method expected "screen and (min-width: 480px), print, projection" but got "[object MediaList]"
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..59fe65753eb9de5d2f92ed2e2d86e55eb6b893d3
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList.html
>@@ -0,0 +1,55 @@
>+<!doctype html>
>+<html>
>+<head>
>+    <meta charset="utf-8">
>+    <title>CSSOM - MediaList interface</title>
>+    <link rel="help" href="https://drafts.csswg.org/cssom/#the-medialist-interface">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+    <style>
>+        @media screen and (min-width: 480px), print, projection {}
>+    </style>
>+
>+    <script>
>+    test(function () {
>+        var media = document.styleSheets[0].cssRules[0].media;
>+        assert_equals(media.length, 3, "MediaList length attribute");
>+        assert_equals(media.mediaText, "screen and (min-width: 480px), print, projection", "MediaList mediaText attribute");
>+        assert_equals(media.toString(), "screen and (min-width: 480px), print, projection", "MediaList toString method");
>+        assert_equals(media[0], "screen and (min-width: 480px)", "MediaList indexed getter");
>+        assert_equals(media[1], "print", "MediaList indexed getter");
>+        assert_equals(media[2], "projection", "MediaList indexed getter");
>+        assert_equals(media[3], undefined, "MediaList indexed getter with out of range");
>+        assert_equals(media.item(0), "screen and (min-width: 480px)", "MediaList item method");
>+        assert_equals(media.item(3), null, "MediaList item method");
>+
>+        media.deleteMedium("print");
>+        assert_equals(media.length, 2, "MediaList length attribute after delete method");
>+        assert_equals(media.mediaText, "screen and (min-width: 480px), projection", "MediaList mediaText attribute after delete method");
>+        assert_equals(media.toString(), "screen and (min-width: 480px), projection", "MediaList toString method after delete method");
>+        assert_equals(media[1], "projection", "MediaList indexed getter after delete method");
>+        assert_equals(media[2], undefined, "MediaList indexed getter with out of range after delete method");
>+        assert_equals(media.item(1), "projection", "MediaList indexed getter after delete method");
>+        assert_equals(media.item(2), null, "MediaList item method after delete method");
>+
>+        media.appendMedium("speech");
>+        assert_equals(media.length, 3, "MediaList length attribute after append method");
>+        assert_equals(media.mediaText, "screen and (min-width: 480px), projection, speech", "MediaList mediaText attribute after append method");
>+        assert_equals(media.toString(), "screen and (min-width: 480px), projection, speech", "MediaList toString method after append method");
>+        assert_equals(media[1], "projection", "MediaList indexed getter after append method");
>+        assert_equals(media[2], "speech", "MediaList indexed getter after append method");
>+        assert_equals(media[3], undefined, "MediaList indexed getter with out of range after append method");
>+        assert_equals(media.item(2), "speech", "MediaList item method after append method");
>+        assert_equals(media.item(3), null, "MediaList item method after append method");
>+
>+        media.mediaText = null;
>+        assert_equals(media.mediaText, "", "MediaList mediaText attribute should be empty string in case of null");
>+        assert_equals(media.toString(), "", "MediaList toString method should be empty string in case of null");
>+
>+        var rule = document.styleSheets[0].cssRules[0];
>+        rule.media = "speech";
>+        assert_equals(rule.media.mediaText, "speech", "MediaList mediaText attribute should be updated");
>+    });
>+    </script>
>+</head>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList2-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList2-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..6b5d51d4bda56b6f5eb1c230d23dad5f5b11f27e
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList2-expected.txt
>@@ -0,0 +1,7 @@
>+
>+PASS MediaList 
>+PASS MediaList.mediaText 
>+PASS MediaList.length 
>+PASS MediaList getter 
>+PASS MediaList.item 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList2.xhtml b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList2.xhtml
>new file mode 100644
>index 0000000000000000000000000000000000000000..ade0ed944a97ff7814907b4543c5f12bbd04ddb5
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList2.xhtml
>@@ -0,0 +1,45 @@
>+<!DOCTYPE html>
>+<html xmlns="http://www.w3.org/1999/xhtml">
>+<head>
>+<title>CSS Test: the MediaList interface</title>
>+<link rel="author" title="Ms2ger" href="mailto:Ms2ger@gmail.com"/>
>+<link rel="help" href="http://www.w3.org/TR/cssom-1/#the-medialist-interface"/>
>+<link rel="help" href="http://dev.w3.org/2006/webapi/WebIDL/#getownproperty"/>
>+<style media="screen, print" id="test-style"></style>
>+<script src="../../../../../resources/testharness.js"/>
>+<script src="../../../../../resources/testharnessreport.js"/>
>+</head>
>+<body>
>+<div id="log"/>
>+<script>
>+test(function() {
>+  var ss = document.styleSheets[0];
>+  assert_equals(ss.ownerNode.id, "test-style", "Got the wrong style element");
>+
>+  var media = ss.media;
>+  test(function() {
>+    // https://www.w3.org/Bugs/Public/show_bug.cgi?id=17526
>+    assert_equals(media.mediaText, "screen, print", "Serialization should be \"screen, print\"");
>+  }, "MediaList.mediaText");
>+
>+  test(function() {
>+    assert_equals(media.length, 2, "Got wrong number of media");
>+  }, "MediaList.length");
>+
>+  test(function() {
>+    assert_equals(media[-1], undefined, "media[-1] should return undefined");
>+    assert_equals(media[0], "screen", "media[0] should return \"screen\"");
>+    assert_equals(media[1], "print", "media[1] should return \"print\"");
>+    assert_equals(media[2], undefined, "media[2] should return undefined");
>+  }, "MediaList getter");
>+
>+  test(function() {
>+    assert_equals(media.item(-1), null, "media.item(-1) should return null");
>+    assert_equals(media.item(0), "screen", "media.item(0) should return \"screen\"");
>+    assert_equals(media.item(1), "print", "media.item(1) should return \"print\"");
>+    assert_equals(media.item(2), null, "media.item(2) should return null");
>+  }, "MediaList.item");
>+}, "MediaList");
>+</script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/OWNERS b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/OWNERS
>new file mode 100644
>index 0000000000000000000000000000000000000000..607f8e85cc2dbc4c4dc35eb9d2c21b5ee4da8882
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/OWNERS
>@@ -0,0 +1,4 @@
>+@dbaron
>+@plinss
>+@lilles
>+@therealglazou
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/StyleSheetList-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/StyleSheetList-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..5dcc47a8ea2e04c810d8ae3b4da9ffe79aeb106e
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/StyleSheetList-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS CSSOM - StyleSheetList interface 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/StyleSheetList.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/StyleSheetList.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..65700522aec62612ee2f82e48c7c150daa759b0e
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/StyleSheetList.html
>@@ -0,0 +1,34 @@
>+<!doctype html>
>+<html>
>+<head>
>+    <meta charset="utf-8">
>+    <title>CSSOM - StyleSheetList interface</title>
>+    <link rel="help" href="https://drafts.csswg.org/cssom/#the-stylesheetlist-interface">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+    <style>
>+        body { width: 50%; }
>+    </style>
>+    <style>
>+        #foo { width: 10%; }
>+        #bar { height: 100px; }
>+    </style>
>+    <script>
>+    test(function () {
>+        var styleSheets = document.styleSheets;
>+        assert_equals(styleSheets.length, 2, "StyleSheetList length attribute");
>+        assert_equals(styleSheets[0].cssRules.length, 1, "StyleSheetList indexed getter length attribute");
>+        assert_equals(styleSheets[1].cssRules.length, 2, "StyleSheetList indexed getter length attribute");
>+        assert_equals(styleSheets[2], undefined, "StyleSheetList indexed getter length attribute");
>+        assert_equals(styleSheets.item(0).cssRules.length, 1, "StyleSheetList item function length attribute");
>+        assert_equals(styleSheets.item(1).cssRules.length, 2, "StyleSheetList item function length attribute");
>+        assert_equals(styleSheets.item(2), null, "StyleSheetList item function length attribute");
>+
>+        styleSheets[0].randomProperty = 1;
>+        var style = document.createElement("style");
>+        document.head.appendChild(style);
>+        assert_equals(styleSheets[0].randomProperty, 1, "[SameObject] StyleSheetList");
>+    });
>+    </script>
>+</head>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-001-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-001-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..354e7730e29d663ff98061a14a24ca8db321f8e7
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-001-expected.txt
>@@ -0,0 +1,6 @@
>+
>+PASS read_only 
>+PASS property_values 
>+PASS inherited_property_values 
>+PASS relative_property_values 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-001.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-001.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..c13fd186725b33f08c68ece5a2a9e475d4596947
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-001.html
>@@ -0,0 +1,70 @@
>+<!DOCTYPE html>
>+<html>
>+ <head>
>+  <title>CSS Test: getComputedStyle</title>
>+  <link rel="author" title="Bear Travis" href="mailto:betravis@adobe.com">
>+  <link rel="help" href="http://www.w3.org/TR/cssom-1/#extensions-to-the-window-interface">
>+  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
>+  <link rel="help" href="http://www.w3.org/TR/cssom-1/#resolved-values">
>+  <meta name="flags" content="dom">
>+  <meta name="assert" content="getComputedStyle returns a readonly CSSStyleDeclaration with resolved values">
>+  <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+  <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+  <style>
>+    #outside {
>+        width: 200px;
>+        height: 200px;
>+    }
>+    #outside div {
>+        font-size: 100px;
>+    }
>+    #inside {
>+        width: 50%;
>+        height: 100px;
>+    }
>+  </style>
>+ </head>
>+ <body>
>+ <noscript>Test not run - javascript required.</noscript>
>+ <div id="log"></div>
>+ <div id="outside"><div id="inside"></div></div>
>+ <script type="text/javascript">
>+    var outer = document.getElementById("outside");
>+    var inner = document.getElementById("inside");
>+    var innerStyle;
>+
>+    test(function() {
>+        innerStyle = window.getComputedStyle(inner);
>+        assert_throws(  "NO_MODIFICATION_ALLOWED_ERR",
>+                        function() { innerStyle.cssText = "color: blue;"; },
>+                        "do not allow setting cssText on a readonly CSSStyleDeclaration");
>+        assert_throws(  "NO_MODIFICATION_ALLOWED_ERR",
>+                        function() { innerStyle.setProperty("color", "blue"); },
>+                        "do not allow calling setProperty on a readonly CSSStyleDeclaration");
>+        assert_throws(  "NO_MODIFICATION_ALLOWED_ERR",
>+                        function() { innerStyle.color = "blue"; },
>+                        "do not allow setting a property on a readonly CSSStyleDeclaration");
>+    }, "read_only", {
>+        assert: "do not allow modifications to a computed CSSStyleDeclaration"
>+    });
>+
>+    test(function() {
>+        assert_equals(innerStyle.getPropertyValue("height"), "100px");
>+    }, "property_values", {
>+        assert: "Directly set properties are resolved"
>+    });
>+
>+    test(function() {
>+        assert_equals(innerStyle.getPropertyValue("font-size"), "100px");
>+    }, "inherited_property_values", {
>+        assert: "Inherited properties are resolved"
>+    });
>+
>+    test(function() {
>+        assert_equals(innerStyle.getPropertyValue("width"), "100px");
>+    }, "relative_property_values", {
>+        assert: "Relative properties are resolved"
>+    });
>+ </script>
>+ </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-002-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-002-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..904641a1fe37cd0180a63590db6066eca3b62e84
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-002-expected.txt
>@@ -0,0 +1,4 @@
>+
>+
>+PASS Check that a percent width in an iframe is resolved against iframe width for getComputedStyle. 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-002.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-002.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..cd7b324ce751a7cd781a79d2dafd3a801edee649
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-002.html
>@@ -0,0 +1,17 @@
>+<!DOCTYPE html>
>+<title>CSS Test: getComputedStyle - resolved width in iframe</title>
>+<link rel="author" title="Rune Lillesveen" href="mailto:futhark@chromium.org" />
>+<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-values" />
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<iframe id="frm" width="100"></iframe>
>+<script>
>+  test(() => {
>+    const frmDoc = frm.contentWindow.document;
>+    frmDoc.open();
>+    frmDoc.write('<body style="margin:0"><div style="width:100%"></div>');
>+    frmDoc.close();
>+
>+    assert_equals(frm.contentWindow.getComputedStyle(frmDoc.querySelector("div")).width, "100px");
>+  }, "Check that a percent width in an iframe is resolved against iframe width for getComputedStyle.");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-003-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-003-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..bb1e6de1948192ad9b508473ac0844d950e1a78f
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-003-expected.txt
>@@ -0,0 +1,4 @@
>+
>+
>+PASS Check that a percent width in an iframe is the resolved width when the iframe is displayed. 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-003.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-003.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..c295451dcb568b62ee7fb45b654db9432f4635b7
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-003.html
>@@ -0,0 +1,20 @@
>+<!DOCTYPE html>
>+<title>CSS Test: getComputedStyle - resolved width in iframe dynamic display</title>
>+<link rel="author" title="Rune Lillesveen" href="mailto:futhark@chromium.org" />
>+<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-values" />
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<iframe id="frm" width="100" style="display:none"></iframe>
>+<script>
>+  const frmDoc = frm.contentWindow.document;
>+  frmDoc.open();
>+  frmDoc.write('<body style="margin:0"><div style="width:100%"></div>');
>+  frmDoc.close();
>+
>+  document.body.offsetWidth; // Make sure we layout the top document.
>+
>+  test(() => {
>+    frm.style.display = "inline";
>+    assert_equals(frm.contentWindow.getComputedStyle(frmDoc.querySelector("div")).width, "100px");
>+  }, "Check that a percent width in an iframe is the resolved width when the iframe is displayed.");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-004-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-004-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..65038c22af0e29c741176536d0ce75efeef7caad
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-004-expected.txt
>@@ -0,0 +1,5 @@
>+
>+
>+PASS Check that the initial width is 100px. 
>+PASS Check that the resolved width of the inner div is affected by changing the width of outer iframe. 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-004.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-004.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..4401a2392d33685559ff9a9b8d60c4afd9bc0ccc
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-004.html
>@@ -0,0 +1,29 @@
>+<!DOCTYPE html>
>+<title>CSS Test: getComputedStyle - resolved width in nested iframes dynamic width</title>
>+<link rel="author" title="Rune Lillesveen" href="mailto:futhark@chromium.org" />
>+<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-values" />
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<iframe id="outer" width="100" scrolling="no" frameborder="0"></iframe>
>+<script>
>+  const outerDoc = outer.contentWindow.document;
>+  outerDoc.open();
>+  outerDoc.write('<body style="margin:0"><iframe id="inner" scrolling="no" frameborder="0" style="width:100%"></iframe>');
>+  outerDoc.close();
>+
>+  const innerWindow = outerDoc.querySelector("#inner").contentWindow;
>+  const innerDoc = innerWindow.document;
>+  innerDoc.open();
>+  innerDoc.write('<body style="margin:0"><div style="width:100%"></div>');
>+  innerDoc.close();
>+  innerDoc.body.offsetWidth; // Make sure we layout the top document.
>+
>+  test(() => {
>+    assert_equals(innerWindow.getComputedStyle(innerDoc.querySelector("div")).width, "100px");
>+  }, "Check that the initial width is 100px.");
>+
>+  test(() => {
>+    outer.setAttribute("width", "200");
>+    assert_equals(innerWindow.getComputedStyle(innerDoc.querySelector("div")).width, "200px");
>+  }, "Check that the resolved width of the inner div is affected by changing the width of outer iframe.");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attr-decl-block-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attr-decl-block-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..01b7eb1747a537b288b118054a17a44b704f3133
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attr-decl-block-expected.txt
>@@ -0,0 +1,8 @@
>+
>+PASS Style attribute should create CSS declaration block based on its content 
>+FAIL Changes to style attribute should reflect on CSS declaration block assert_equals: CSS declaration block after removing the style attribute expected "" but got "z-index: 21;"
>+PASS Changes to CSS declaration block should reflect on style attribute 
>+PASS Changes to CSS declaration block should queue mutation record for style attribute 
>+PASS Removing non-existing property or setting invalid value on CSS declaration block shouldn't queue mutation record 
>+PASS Changes to CSS declaration block after a base URL change 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attr-decl-block.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attr-decl-block.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..c8c638490a381d0b815282182b182abee6f7d5a2
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attr-decl-block.html
>@@ -0,0 +1,133 @@
>+<!DOCTYPE html>
>+<meta charset="UTF-8">
>+<link rel="author" title="Xidorn Quan" href="mailto:me@upsuper.org">
>+<link rel="help" href="https://drafts.csswg.org/cssom-1/#css-declaration-blocks">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<body>
>+<script>
>+function createTestElement(style) {
>+  let wrapper = document.createElement("div");
>+  wrapper.innerHTML = `<div id="test" style="${style}"></div>`;
>+  return wrapper.querySelector("#test");
>+}
>+
>+test(function() {
>+  let elem = createTestElement("z-index: 10;");
>+  assert_equals(elem.style.cssText, "z-index: 10;");
>+}, "Style attribute should create CSS declaration block based on its content");
>+
>+test(function() {
>+  let elem = createTestElement("z-index: 20;");
>+  let style = elem.style;
>+  assert_equals(style.cssText, "z-index: 20;");
>+  function assert_css_text(value, action) {
>+    assert_equals(style.cssText, value, "CSS declaration block after " + action);
>+  }
>+  elem.setAttribute("style", "z-index: 21;");
>+  assert_css_text("z-index: 21;", "changing the style attribute");
>+  elem.removeAttribute("style");
>+  assert_css_text("", "removing the style attribute");
>+  elem.setAttribute("style", "position: absolute;");
>+  assert_css_text("position: absolute;", "adding style attribute again");
>+}, "Changes to style attribute should reflect on CSS declaration block");
>+
>+test(function() {
>+  let elem = createTestElement("z-index: 30;");
>+  let style = elem.style;
>+  assert_equals(style.cssText, "z-index: 30;");
>+  function assert_attr(value, action) {
>+    assert_equals(elem.getAttribute("style"), value, "style attribute after " + action);
>+  }
>+  style.setProperty("z-index", "31");
>+  assert_attr("z-index: 31;", "changing property in CSS declaration block");
>+  style.removeProperty("z-index");
>+  assert_attr("", "removing property from CSS declaration block");
>+  style.setProperty("position", "absolute");
>+  assert_attr("position: absolute;", "adding property to CSS declaration block");
>+  style.cssText = "z-index: 32;";
>+  assert_attr("z-index: 32;", "changing cssText");
>+  style.cssText = "z-index: 33; invalid";
>+  assert_attr("z-index: 33;", "changing cssText to a partial invalid value");
>+}, "Changes to CSS declaration block should reflect on style attribute");
>+
>+test(function() {
>+  let elem = createTestElement("z-index: 40;");
>+  let style = elem.style;
>+  assert_equals(style.cssText, "z-index: 40;");
>+  // Create an observer for the element.
>+  let observer = new MutationObserver(function() {});
>+  observer.observe(elem, {attributes: true, attributeOldValue: true});
>+  function assert_record_with_old_value(oldValue, action) {
>+    let records = observer.takeRecords();
>+    assert_equals(records.length, 1, "number of mutation records after " + action);
>+    let record = records[0];
>+    assert_equals(record.type, "attributes", "mutation type after " + action);
>+    assert_equals(record.attributeName, "style", "mutated attribute after " + action);
>+    assert_equals(record.oldValue, oldValue, "old value after " + action);
>+  }
>+  style.setProperty("z-index", "41");
>+  assert_record_with_old_value("z-index: 40;", "changing property in CSS declaration block");
>+  style.cssText = "z-index: 42;";
>+  assert_record_with_old_value("z-index: 41;", "changing cssText");
>+  style.cssText = "z-index: 42;";
>+  assert_record_with_old_value("z-index: 42;", "changing cssText with the same content");
>+  style.removeProperty("z-index");
>+  assert_record_with_old_value("z-index: 42;", "removing property from CSS declaration block");
>+  // Mutation to shorthand properties should also trigger only one mutation record.
>+  style.setProperty("margin", "1px");
>+  assert_record_with_old_value("", "adding shorthand property to CSS declaration block");
>+  style.removeProperty("margin");
>+  assert_record_with_old_value("margin: 1px;", "removing shorthand property from CSS declaration block");
>+  // Final sanity check.
>+  assert_equals(elem.getAttribute("style"), "");
>+}, "Changes to CSS declaration block should queue mutation record for style attribute");
>+
>+test(function() {
>+  let elem = createTestElement("z-index: 50; invalid");
>+  let style = elem.style;
>+  assert_equals(style.cssText, "z-index: 50;");
>+  // Create an observer for the element.
>+  let observer = new MutationObserver(function() {});
>+  observer.observe(elem, {attributes: true});
>+  function assert_no_record(action) {
>+    let records = observer.takeRecords();
>+    assert_true(records.length == 0, "expect no record after " + action);
>+  }
>+  style.setProperty("z-index", "invalid");
>+  assert_no_record("setting invalid value to property");
>+  // Longhand property.
>+  style.removeProperty("position");
>+  assert_no_record("removing non-existing longhand property");
>+  style.setProperty("position", "");
>+  assert_no_record("setting empty string to non-existing longhand property");
>+  // Shorthand property.
>+  style.removeProperty("margin");
>+  assert_no_record("removing non-existing shorthand property");
>+  style.setProperty("margin", "");
>+  assert_no_record("setting empty string to non-existing shorthand property");
>+  // Check that the value really isn't changed.
>+  assert_equals(elem.getAttribute("style"), "z-index: 50; invalid",
>+                "style attribute after removing non-existing properties");
>+}, "Removing non-existing property or setting invalid value on CSS declaration block shouldn't queue mutation record");
>+
>+test(function() {
>+  let elem = createTestElement("background-image: url(./);");
>+  let style = elem.style;
>+  let base = document.createElement("base");
>+  base.href = "/";
>+  document.body.appendChild(elem);
>+  let originalComputedValue = getComputedStyle(elem).backgroundImage;
>+  document.head.appendChild(base);
>+  this.add_cleanup(() => {
>+    document.head.removeChild(base);
>+    document.body.removeChild(elem);
>+  });
>+  style.setProperty("background-color", "green");
>+  assert_equals(getComputedStyle(elem).backgroundImage, originalComputedValue,
>+                "getComputedStyle(elem).backgroundImage after setting background-color");
>+  style.setProperty("background-image", "url(./)");
>+  assert_not_equals(getComputedStyle(elem).backgroundImage, originalComputedValue,
>+                    "getComputedStyle(elem).backgroundImage after setting background-image");
>+}, "Changes to CSS declaration block after a base URL change");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attribute-modifications-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attribute-modifications-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..fb8cfc3aa4285ea95ecde47950baacacdedc0f6c
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attribute-modifications-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS Mutating the style declaration doesn't remove the style attribute 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attribute-modifications.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attribute-modifications.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..61de84dbf7540c71dbded7fa664b6e61c4c998dc
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attribute-modifications.html
>@@ -0,0 +1,16 @@
>+<!DOCTYPE html>
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:ecobos@igalia.com">
>+<link rel="help" href="https://drafts.csswg.org/cssom/#the-elementcssinlinestyle-interface">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<div id="test" style="color: red"></div>
>+<script>
>+test(function() {
>+  var el = document.getElementById("test");
>+  el.style.color = "";
>+  assert_true(el.hasAttribute("style"));
>+
>+  el.removeAttribute("style");
>+  assert_false(el.hasAttribute("style"));
>+}, "Mutating the style declaration doesn't remove the style attribute");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-declaration-modifications-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-declaration-modifications-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..096aa6e7e68ad172766e959e4746f6d9a1d7e73a
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-declaration-modifications-expected.txt
>@@ -0,0 +1,5 @@
>+
>+PASS Reading CSSStyleDeclaration initialized from a style element 
>+PASS Setting CSSStyleDeclaration#cssText 
>+PASS Calling CSSStyleDeclaration#setProperty 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-declaration-modifications.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-declaration-modifications.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..26a86e21eb0e42f56d8423e77ed35dbb91adc2a4
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-declaration-modifications.html
>@@ -0,0 +1,63 @@
>+<!DOCTYPE html>
>+<html>
>+ <head>
>+  <title>CSS Test: CSSStyleDeclaration Interface</title>
>+  <link rel="author" title="Bear Travis" href="mailto:betravis@adobe.com">
>+  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
>+  <meta name="flags" content="dom">
>+  <meta name="assert" content="CSSStyleDeclaration is properly initialized and can be modified through its interface">
>+  <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+  <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+  <style id="styleElement">
>+      #test { color: green; }
>+  </style>
>+ </head>
>+ <body>
>+ <div id="log"></div>
>+ <div id="test"></div>
>+ <script type="text/javascript">
>+    var declaration;
>+    setup(function() {
>+        var styleElement = document.getElementById("styleElement");
>+        declaration = styleElement.sheet.cssRules.item(0).style;
>+    });
>+
>+    test(function() {
>+        assert_equals(declaration.cssText, "color: green;");
>+        assert_equals(declaration.getPropertyValue("color"), "green");
>+    }, "Reading CSSStyleDeclaration initialized from a style element");
>+
>+    test(function() {
>+        declaration.cssText = "margin-left:10px;  padding-left:10px";
>+        assert_equals(declaration.cssText, "margin-left: 10px; padding-left: 10px;");
>+        assert_equals(declaration.length, 2);
>+        assert_equals(declaration.item(0), "margin-left");
>+        assert_equals(declaration.item(1), "padding-left");
>+        assert_equals(declaration.getPropertyValue("margin-left"), "10px");
>+        assert_equals(declaration.getPropertyValue("padding-left"), "10px");
>+
>+        var computedStyle = window.getComputedStyle(document.getElementById("test"));
>+        assert_equals(computedStyle.getPropertyValue("margin-left"), "10px");
>+        assert_equals(computedStyle.getPropertyValue("padding-left"), "10px");
>+    }, "Setting CSSStyleDeclaration#cssText");
>+
>+    test(function() {
>+        while (declaration.length > 0) {
>+            declaration.removeProperty(declaration.item(0));
>+        }
>+        declaration.setProperty("margin-left", "15px");
>+        declaration.setProperty("padding-left", "15px");
>+
>+        assert_equals(declaration.length, 2);
>+        assert_equals(declaration.item(0), "margin-left");
>+        assert_equals(declaration.item(1), "padding-left");
>+        assert_equals(declaration.getPropertyValue("margin-left"), "15px");
>+        assert_equals(declaration.getPropertyValue("padding-left"), "15px");
>+
>+        var computedStyle = window.getComputedStyle(document.getElementById("test"));
>+        assert_equals(computedStyle.getPropertyValue("margin-left"), "15px");
>+        assert_equals(computedStyle.getPropertyValue("padding-left"), "15px");
>+    }, "Calling CSSStyleDeclaration#setProperty");
>+ </script>
>+ </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-reparse-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-reparse-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..6ce2b01d363b3785042fbd0ca6e327e424931cd4
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-reparse-expected.txt
>@@ -0,0 +1,4 @@
>+
>+PASS style.textContent modification 
>+PASS style.innerHTML modification 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-reparse.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-reparse.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..f3d0dd68466d89ad6fef7299790b3a5fe202a5af
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-reparse.html
>@@ -0,0 +1,59 @@
>+<!doctype html>
>+<html>
>+<head>
>+  <meta charset=utf-8>
>+  <title>CSS Test: DOM modification re-parsing test</title>
>+  <link rel="help" href="https://drafts.csswg.org/cssom/">
>+  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>+  <script src=../../../../../resources/testharness.js></script>
>+  <script src=../../../../../resources/testharnessreport.js></script>
>+  <style>div { min-width: 0px; }</style>
>+  <style id="style-element"></style>
>+</head>
>+<body>
>+<div id="test-div"></div>
>+<script type="text/javascript">
>+    var style = document.getElementById("style-element");
>+    var div = document.getElementById("test-div");
>+
>+    function testProperty(prop) {
>+      // Assigning an empty string to textContent or innerHTML should trigger a
>+      // reparse only if the element is not empty.
>+      style.sheet.insertRule("#test-div { min-width: 42px; }");
>+      assert_equals(getComputedStyle(div).minWidth, "42px");
>+
>+      style[prop] = "";
>+      assert_equals(getComputedStyle(div).minWidth, "42px");
>+
>+      style[prop] = " ";
>+      assert_equals(getComputedStyle(div).minWidth, "0px");
>+
>+      style.sheet.insertRule("#test-div { min-width: 42px; }");
>+      assert_equals(getComputedStyle(div).minWidth, "42px");
>+
>+      style[prop] = "";
>+      assert_equals(getComputedStyle(div).minWidth, "0px");
>+
>+      style.sheet.insertRule("#test-div { min-width: 42px; }");
>+      assert_equals(getComputedStyle(div).minWidth, "42px");
>+
>+      style.appendChild(document.createTextNode(""));
>+      assert_equals(getComputedStyle(div).minWidth, "0px");
>+
>+      style.sheet.insertRule("#test-div { min-width: 42px; }");
>+      assert_equals(getComputedStyle(div).minWidth, "42px");
>+
>+      style[prop] = "";
>+      assert_equals(getComputedStyle(div).minWidth, "0px");
>+    }
>+
>+    test(function() {
>+      testProperty("textContent");
>+    }, "style.textContent modification");
>+
>+    test(function() {
>+      testProperty("innerHTML");
>+    }, "style.innerHTML modification");
>+</script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssimportrule-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssimportrule-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..647dc39b6eb984aaa693f12b91bfc33c00098e28
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssimportrule-expected.txt
>@@ -0,0 +1,11 @@
>+
>+PASS CSSRule and CSSImportRule types 
>+PASS Type of CSSRule#type and constant values 
>+PASS Existence and writability of CSSRule attributes 
>+PASS Values of CSSRule attributes 
>+PASS Existence and writability of CSSImportRule attributes 
>+PASS Values of CSSImportRule attributes 
>+FAIL CSSImportRule : MediaList mediaText attribute should be updated due to [PutForwards] assert_equals: expected "print" but got "screen"
>+PASS CSSStyleDeclaration cssText attribute should be updated due to [PutForwards] 
>+FAIL StyleSheet : MediaList mediaText attribute should be updated due to [PutForwards] assert_equals: expected "screen" but got ""
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssimportrule.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssimportrule.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..877ad9d0a42c63446aa9a4ddbb336bbfb5507c39
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssimportrule.html
>@@ -0,0 +1,108 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <title>CSSOM CSSRule CSSImportRule interface</title>
>+    <link rel="author" title="Letitia Lew" href="mailto:lew.letitia@gmail.com">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-rules">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssimportrule-interface">
>+    <meta name="flags" content="dom">
>+    <meta name="assert" content="All properties for this CSSImportRule instance of CSSRule are initialized correctly">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+
>+    <style id="styleElement" type="text/css">
>+        @import url("support/a-green.css");
>+        @import url("support/a-green.css") screen;
>+        @import url("support/a-green.css") all;
>+        @page { background-color: red; }
>+    </style>
>+</head>
>+<body>
>+    <div id="log"></div>
>+
>+    <script type="text/javascript">
>+        var styleSheet, ruleList, rule, ruleWithMedia, ruleWithMediaAll;
>+        setup(function() {
>+            styleSheet = document.getElementById("styleElement").sheet;
>+            ruleList = styleSheet.cssRules;
>+            rule = ruleList[0];
>+            ruleWithMedia = ruleList[1];
>+            ruleWithMediaAll = ruleList[2];
>+        });
>+
>+        test(function() {
>+            assert_true(rule instanceof CSSRule);
>+            assert_true(rule instanceof CSSImportRule);
>+            assert_true(ruleWithMedia instanceof CSSRule);
>+            assert_true(ruleWithMedia instanceof CSSImportRule);
>+        }, "CSSRule and CSSImportRule types");
>+
>+        test(function() {
>+            assert_equals(rule.STYLE_RULE, 1);
>+            assert_equals(rule.IMPORT_RULE, 3);
>+            assert_equals(rule.MEDIA_RULE, 4);
>+            assert_equals(rule.FONT_FACE_RULE, 5);
>+            assert_equals(rule.PAGE_RULE, 6);
>+            assert_equals(rule.NAMESPACE_RULE, 10);
>+            assert_idl_attribute(rule, "type");
>+            assert_equals(typeof rule.type, "number");
>+        }, "Type of CSSRule#type and constant values");
>+
>+        test(function() {
>+            assert_true(rule instanceof CSSRule);
>+            assert_idl_attribute(rule, "cssText");
>+            assert_idl_attribute(rule, "parentRule");
>+            assert_idl_attribute(rule, "parentStyleSheet");
>+
>+            assert_readonly(rule, "type");
>+            assert_readonly(rule, "parentRule");
>+            assert_readonly(rule, "parentStyleSheet");
>+        }, "Existence and writability of CSSRule attributes");
>+
>+        test(function() {
>+            assert_equals(rule.type, rule.IMPORT_RULE);
>+            assert_equals(typeof rule.cssText, "string");
>+            assert_equals(rule.cssText, '@import url("support/a-green.css");');
>+            assert_equals(ruleWithMedia.cssText, '@import url("support/a-green.css") screen;');
>+            assert_equals(ruleWithMediaAll.cssText, '@import url("support/a-green.css") all;');
>+            assert_equals(rule.parentRule, null);
>+            assert_true(rule.parentStyleSheet instanceof CSSStyleSheet);
>+        }, "Values of CSSRule attributes");
>+
>+        test(function() {
>+            assert_idl_attribute(rule, "href");
>+            assert_idl_attribute(rule, "media");
>+            assert_idl_attribute(rule, "styleSheet");
>+
>+            assert_readonly(rule, "href");
>+            assert_readonly(rule, "media");
>+            assert_readonly(rule, "styleSheet");
>+        }, "Existence and writability of CSSImportRule attributes");
>+
>+        test(function() {
>+            assert_equals(typeof rule.href, "string");
>+            assert_true(rule.media instanceof MediaList);
>+            assert_true(rule.styleSheet instanceof CSSStyleSheet);
>+            assert_true(ruleWithMedia.media.length > 0);
>+            assert_equals(ruleWithMedia.media.mediaText, "screen");
>+        }, "Values of CSSImportRule attributes");
>+
>+        test(function() {
>+            ruleWithMedia.media = "print";
>+            assert_equals(ruleWithMedia.media.mediaText, "print");
>+        }, "CSSImportRule : MediaList mediaText attribute should be updated due to [PutForwards]");
>+
>+        test(function() {
>+            var ruleWithPage = ruleList[3];
>+            ruleWithPage.style = "background-color: green;"
>+            assert_equals(ruleWithPage.style.cssText, "background-color: green;");
>+        }, "CSSStyleDeclaration cssText attribute should be updated due to [PutForwards]");
>+
>+        test(function() {
>+            styleSheet.media = "screen";
>+            assert_equals(styleSheet.media.mediaText, "screen");
>+        }, "StyleSheet : MediaList mediaText attribute should be updated due to [PutForwards]");
>+    </script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssText-serialize-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssText-serialize-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..04e11aa7e9643e2b3b8f696e36b9fb9e396b7449
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssText-serialize-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS CSSStyleDeclaration cssText serializes declaration blocks. 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssText-serialize.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssText-serialize.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..cbf656cc311ef83e899eb4141682be669348ec10
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssText-serialize.html
>@@ -0,0 +1,28 @@
>+<!DOCTYPE html>
>+<html>
>+    <head>
>+        <title>CSSOM Parsing Test: getting cssText must return the result of serializing the CSS declaration blocks.</title>
>+        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
>+        <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
>+
>+        <link rel="source" href="http://trac.webkit.org/export/120528/trunk/LayoutTests/fast/css/cssText-cache.html">
>+        <meta name="flags" content="dom">
>+
>+        <script src="../../../../../resources/testharness.js"></script>
>+        <script src="../../../../../resources/testharnessreport.js"></script>
>+    </head>
>+
>+    <body>
>+        <div id="log"></div>
>+        <div id="box"></div>
>+        <script>
>+          test(function() {
>+            var style = document.getElementById('box').style;
>+            style.left = "10px";
>+            assert_equals(style.cssText, "left: 10px;");
>+            style.right = "20px";
>+            assert_equals(style.cssText, "left: 10px; right: 20px;");
>+          }, 'CSSStyleDeclaration cssText serializes declaration blocks.');
>+        </script>
>+    </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssstyledeclaration-set-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssstyledeclaration-set-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..c6c1f9611ca75912c071511c65c3035e4f0f04c6
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssstyledeclaration-set-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS CSSStyleDeclaration on HTMLElement represents inline style changes 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssstyledeclaration-set.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssstyledeclaration-set.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..3648a7799dc0b72091ef8c39ba782c2681930ee7
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssstyledeclaration-set.html
>@@ -0,0 +1,37 @@
>+<!DOCTYPE html>
>+<html>
>+    <head>
>+        <title>CSSOM: CSSStyleDeclaration on HTMLElement represents inline style changes</title>
>+        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
>+        <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
>+
>+        <link rel="source" href="http://trac.webkit.org/export/120528/trunk/LayoutTests/fast/css/cssText-cache.html">
>+        <meta name="flags" content="dom">
>+
>+        <script src="../../../../../resources/testharness.js"></script>
>+        <script src="../../../../../resources/testharnessreport.js"></script>
>+    </head>
>+
>+    <body>
>+        <div id="log"></div>
>+
>+        <div id="box"></div>
>+
>+        <script>
>+
>+          var style = document.getElementById('box').style;
>+
>+          test(function(){
>+
>+            style.left = "10px";
>+            assert_equals(style.left, "10px", 'left property set on element\'s CSSStyleDeclaration Object');
>+            style.left = "20px";
>+            assert_equals(style.left, "20px", 'left property set on element\'s CSSStyleDeclaration Object');
>+
>+          }, 'CSSStyleDeclaration on HTMLElement represents inline style changes');
>+
>+        </script>
>+
>+
>+    </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule-constructors-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule-constructors-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..4107427a1d4de19b3478028778a2ab234544afd4
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule-constructors-expected.txt
>@@ -0,0 +1,4 @@
>+
>+PASS @font-face declarations are instances of CSSFontFaceRule 
>+PASS The style attribute must return a CSSStyleDeclaration block 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule-constructors.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule-constructors.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..b2fd6dc2fabce215927f8d7f26aef76ca96931d7
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule-constructors.html
>@@ -0,0 +1,63 @@
>+<!DOCTYPE html>
>+<html>
>+    <head>
>+        <title>CSSOM Parsing Test: @font-face rules toString() as valid interfaces</title>
>+        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
>+        <link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> 
>+        <link rel="help" href="https://drafts.csswg.org/css-fonts-4/#om-fontface">
>+
>+        <meta name="flags" content="dom">
>+
>+        <script src="../../../../../resources/testharness.js"></script>
>+        <script src="../../../../../resources/testharnessreport.js"></script>
>+    </head>
>+
>+    <body>
>+        <div id="log"></div>
>+
>+
>+        <style id="teststyles">
>+        @font-face {
>+            src: url(http://foo/bar/font.ttf);
>+        }
>+        @font-face {
>+            font-family: STIXGeneral;
>+            src: local(STIXGeneral), url(/stixfonts/STIXGeneral.otf);
>+            unicode-range: U+000-49F, U+2000-27FF, U+2900-2BFF, U+1D400-1D7FF;
>+        }
>+        @font-face {
>+            font-family: MainText;
>+            src: url(http://example.com/font.ttf);
>+            font-variant: oldstyle-nums proportional-nums styleset(1,3);
>+        }
>+
>+       @font-face {
>+            font-family: BodyText;
>+            src: local("HiraMaruPro-W4");
>+            font-variant: proportional-width;
>+            font-feature-settings: "ital"; /* Latin italics within CJK text feature */
>+        }
>+        </style>
>+
>+
>+        <script>
>+            var validRules = document.getElementById('teststyles').sheet.cssRules;
>+
>+            test(function(){
>+                for (var i = 0; i < validRules.length; ++i) {
>+                    assert_equals(validRules.item(i).toString(), '[object CSSFontFaceRule]');
>+                }
>+            }, '@font-face declarations are instances of CSSFontFaceRule')
>+
>+
>+            test(function(){
>+                for (var i = 0; i < validRules.length; ++i) {
>+                    assert_equals(validRules.item(i).style.toString(), '[object CSSStyleDeclaration]');
>+                }
>+            }, 'The style attribute must return a CSSStyleDeclaration block')
>+
>+        </script>
>+
>+
>+    </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..81fcbdc22cc9abc16b7ed59cdf4a5608bf126ec0
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule-expected.txt
>@@ -0,0 +1,3 @@
>+
>+FAIL CSSStyleDeclaration values are represented within CSSFontFaceRule assert_equals: expected "url(\"http://foo/bar/font.ttf\")" but got "url(http://foo/bar/font.ttf)"
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..4592061387b1b2715020cdcaf21891480c02f688
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule.html
>@@ -0,0 +1,58 @@
>+<!DOCTYPE html>
>+<html>
>+    <head>
>+        <title>CSSOM Parsing Test: @font-face rules parsed into CSSOM CSSFontFaceRules</title>
>+        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
>+        <link rel="help" href="https://drafts.csswg.org/css-fonts-4/#om-fontface">
>+
>+        <meta name="flags" content="dom">
>+
>+        <script src="../../../../../resources/testharness.js"></script>
>+        <script src="../../../../../resources/testharnessreport.js"></script>
>+    </head>
>+
>+    <body>
>+        <div id="log"></div>
>+
>+
>+        <style id="teststyles">
>+        @font-face {
>+            src: url(http://foo/bar/font.ttf);
>+        }
>+        @font-face {
>+            font-family: STIXGeneral;
>+            src: local(STIXGeneral), url(/stixfonts/STIXGeneral.otf);
>+            unicode-range: U+000-49F, U+2000-27FF, U+2900-2BFF, U+1D400-1D7FF;
>+        }
>+        @font-face {
>+            font-family: MainText;
>+            src: url(http://example.com/font.ttf);
>+            font-variant: oldstyle-nums proportional-nums styleset(1,3);
>+        }
>+
>+       @font-face {
>+            font-family: BodyText;
>+            src: local("HiraMaruPro-W4");
>+            font-variant: proportional-width;
>+            font-feature-settings: "ital"; /* Latin italics within CJK text feature */
>+        }
>+        </style>
>+
>+
>+        <script>
>+            var validRules = document.getElementById('teststyles').sheet.cssRules;
>+
>+            test(function(){
>+
>+                assert_equals(validRules[0].style.src, 'url("http://foo/bar/font.ttf")');
>+                assert_equals(validRules[1].style.fontFamily, 'STIXGeneral');
>+
>+                /* unimplemented @font-face properties are not represented in CSSOM */
>+
>+            }, 'CSSStyleDeclaration values are represented within CSSFontFaceRule')
>+
>+        </script>
>+
>+
>+    </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-ruleTypeAndOrder-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-ruleTypeAndOrder-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..c89a92434a195f6671bbf86f0cfea92714dad88b
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-ruleTypeAndOrder-expected.txt
>@@ -0,0 +1,9 @@
>+
>+PASS Type of #s-0 is expected to be namespace rule 
>+PASS Type of #s-1 is expected to be @import rule 
>+PASS Type of #s-2 is expected to be style rule 
>+PASS Type of #s-3 is expected to be style rule 
>+PASS Type of #s-4 is expected to be @font-face rule 
>+PASS Type of #s-5 is expected to be media rule 
>+PASS Type of #s-6 is expected to be page rule 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-ruleTypeAndOrder.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-ruleTypeAndOrder.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..b5e0856a0b66b4d107286e6d897b2a3466d0fadc
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-ruleTypeAndOrder.html
>@@ -0,0 +1,75 @@
>+<!doctype html>
>+<head>
>+  <title>CSS OM: CSS Rule Types and Order</title>
>+  <link rel="help" href="https://drafts.csswg.org/cssom-1/#the-cssrule-interface">
>+  <meta name="flags" content="dom">
>+  <meta name="assert" content="Testing Serialization of Style Rules">
>+  <script src="../../../../../resources/testharness.js"></script>
>+  <script src="../../../../../resources/testharnessreport.js"></script>
>+  <style id="s-0">
>+    @namespace svg "http://www.w3.org/2000/svg";
>+  </style>
>+  <style id="s-1">
>+    @import url('main.css');
>+  </style>
>+  <style id="s-2">
>+    h1 { background: indianred; }
>+  </style>
>+  <style id="s-3">
>+    @namespace svg "http://www.w3.org/2000/svg";
>+    svg|a { color: white; }
>+  </style>
>+  <style id="s-4">
>+    @font-face {
>+      font-family: 'Megalopolis';
>+      src: url('fonts/megalopolisextra-webfont.eot');
>+      src: url('fonts/megalopolisextra-webfont.eot?#iefix') format('embedded-opentype'),
>+           url('fonts/megalopolisextra-webfont.woff') format('woff'),
>+           url('fonts/megalopolisextra-webfont.ttf') format('truetype'),
>+           url('fonts/megalopolisextra-webfont.svg#MEgalopolisExtraRegular') format('svg');
>+      font-weight: normal;
>+      font-style: normal;
>+    }
>+  </style>
>+  <style id="s-5">
>+    @media (min-width: 200px) {
>+        h1 { background: aliceblue; }
>+    }
>+  </style>
>+  <style id="s-6">
>+    @page :first {
>+        h1 { color: #444; }
>+    }
>+  </style>
>+</head>
>+<body>
>+  <div id="log"></div>
>+  <script type="text/javascript">
>+    "use strict";
>+
>+    var stylesheets = document.styleSheets;
>+
>+    var expectedOrderOfTypes = [10, 3, 1, 1, 5, 4, 6];
>+
>+    var typesText = {
>+      1: 'style rule',
>+      3: '@import rule',
>+      4: 'media rule',
>+      5: '@font-face rule',
>+      6: 'page rule',
>+      10: 'namespace rule'
>+    };
>+
>+    for (var i = 0; i < stylesheets.length; i++) {
>+      test( function () {
>+          if (i === 3) {
>+            var cssType = stylesheets[i].cssRules[1].type;
>+          } else {
>+            var cssType = stylesheets[i].cssRules[0].type;
>+          }
>+          assert_equals(typesText[cssType], typesText[expectedOrderOfTypes[i]]);
>+      }, 'Type of #s-' + i + ' is expected to be ' + typesText[expectedOrderOfTypes[i]]);
>+    }
>+  </script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-setProperty-shorthand-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-setProperty-shorthand-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..97663b57a7e2742c329a59e09d84d91f05e7765c
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-setProperty-shorthand-expected.txt
>@@ -0,0 +1,78 @@
>+
>+PASS shorthand font can be set with setProperty 
>+PASS shorthand font can be removed with removeProperty 
>+PASS shorthand font can be set with setProperty and priority !important 
>+PASS shorthand font can be removed with removeProperty even when set with !important 
>+PASS shorthand border-top can be set with setProperty 
>+PASS shorthand border-top can be removed with removeProperty 
>+PASS shorthand border-top can be set with setProperty and priority !important 
>+PASS shorthand border-top can be removed with removeProperty even when set with !important 
>+PASS shorthand border-right can be set with setProperty 
>+PASS shorthand border-right can be removed with removeProperty 
>+PASS shorthand border-right can be set with setProperty and priority !important 
>+PASS shorthand border-right can be removed with removeProperty even when set with !important 
>+PASS shorthand border-bottom can be set with setProperty 
>+PASS shorthand border-bottom can be removed with removeProperty 
>+PASS shorthand border-bottom can be set with setProperty and priority !important 
>+PASS shorthand border-bottom can be removed with removeProperty even when set with !important 
>+PASS shorthand border-left can be set with setProperty 
>+PASS shorthand border-left can be removed with removeProperty 
>+PASS shorthand border-left can be set with setProperty and priority !important 
>+PASS shorthand border-left can be removed with removeProperty even when set with !important 
>+PASS shorthand border can be set with setProperty 
>+PASS shorthand border can be removed with removeProperty 
>+PASS shorthand border can be set with setProperty and priority !important 
>+PASS shorthand border can be removed with removeProperty even when set with !important 
>+PASS shorthand border-color can be set with setProperty 
>+PASS shorthand border-color can be removed with removeProperty 
>+PASS shorthand border-color can be set with setProperty and priority !important 
>+PASS shorthand border-color can be removed with removeProperty even when set with !important 
>+PASS shorthand border-style can be set with setProperty 
>+PASS shorthand border-style can be removed with removeProperty 
>+PASS shorthand border-style can be set with setProperty and priority !important 
>+PASS shorthand border-style can be removed with removeProperty even when set with !important 
>+PASS shorthand border-width can be set with setProperty 
>+PASS shorthand border-width can be removed with removeProperty 
>+PASS shorthand border-width can be set with setProperty and priority !important 
>+PASS shorthand border-width can be removed with removeProperty even when set with !important 
>+PASS shorthand background-position can be set with setProperty 
>+PASS shorthand background-position can be removed with removeProperty 
>+PASS shorthand background-position can be set with setProperty and priority !important 
>+PASS shorthand background-position can be removed with removeProperty even when set with !important 
>+PASS shorthand background-repeat can be set with setProperty 
>+PASS shorthand background-repeat can be removed with removeProperty 
>+PASS shorthand background-repeat can be set with setProperty and priority !important 
>+PASS shorthand background-repeat can be removed with removeProperty even when set with !important 
>+PASS shorthand border-spacing can be set with setProperty 
>+PASS shorthand border-spacing can be removed with removeProperty 
>+PASS shorthand border-spacing can be set with setProperty and priority !important 
>+PASS shorthand border-spacing can be removed with removeProperty even when set with !important 
>+PASS shorthand list-style can be set with setProperty 
>+PASS shorthand list-style can be removed with removeProperty 
>+PASS shorthand list-style can be set with setProperty and priority !important 
>+PASS shorthand list-style can be removed with removeProperty even when set with !important 
>+PASS shorthand margin can be set with setProperty 
>+PASS shorthand margin can be removed with removeProperty 
>+PASS shorthand margin can be set with setProperty and priority !important 
>+PASS shorthand margin can be removed with removeProperty even when set with !important 
>+PASS shorthand outline can be set with setProperty 
>+PASS shorthand outline can be removed with removeProperty 
>+PASS shorthand outline can be set with setProperty and priority !important 
>+PASS shorthand outline can be removed with removeProperty even when set with !important 
>+PASS shorthand padding can be set with setProperty 
>+PASS shorthand padding can be removed with removeProperty 
>+PASS shorthand padding can be set with setProperty and priority !important 
>+PASS shorthand padding can be removed with removeProperty even when set with !important 
>+PASS shorthand background can be set with setProperty 
>+PASS shorthand background can be removed with removeProperty 
>+PASS shorthand background can be set with setProperty and priority !important 
>+PASS shorthand background can be removed with removeProperty even when set with !important 
>+PASS shorthand overflow can be set with setProperty 
>+PASS shorthand overflow can be removed with removeProperty 
>+PASS shorthand overflow can be set with setProperty and priority !important 
>+PASS shorthand overflow can be removed with removeProperty even when set with !important 
>+PASS shorthand border-radius can be set with setProperty 
>+PASS shorthand border-radius can be removed with removeProperty 
>+PASS shorthand border-radius can be set with setProperty and priority !important 
>+PASS shorthand border-radius can be removed with removeProperty even when set with !important 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-setProperty-shorthand.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-setProperty-shorthand.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..cdff9a941c2a48398eff626871569d3e798373b4
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-setProperty-shorthand.html
>@@ -0,0 +1,77 @@
>+<!DOCTYPE html>
>+<html>
>+    <head>
>+        <title>CSSOM: CSSStyleDeclaration (set|remove)PropertyValue sets/removes shorthand properties</title>
>+        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
>+        <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
>+
>+        <link rel="source" href="http://trac.webkit.org/export/120528/trunk/LayoutTests/fast/css/cssom-remove-shorthand-property.html">
>+        <meta name="flags" content="dom">
>+
>+        <script src="../../../../../resources/testharness.js"></script>
>+        <script src="../../../../../resources/testharnessreport.js"></script>
>+    </head>
>+
>+    <body>
>+        <div id="log"></div>
>+
>+        <div id="box"></div>
>+
>+        <script>
>+            shorthandProperties = [
>+                "font",
>+                "border-top",
>+                "border-right",
>+                "border-bottom",
>+                "border-left",
>+                "border",
>+                "border-color",
>+                "border-style",
>+                "border-width",
>+                "background-position",
>+                "background-repeat",
>+                "border-spacing",
>+                "list-style",
>+                "margin",
>+                "outline",
>+                "padding",
>+                "background",
>+                "overflow",
>+                "border-radius"
>+            ];
>+
>+            element = document.createElement('span');
>+
>+            function canSetProperty(propertyName, priority) {
>+                element.style.setProperty(propertyName, 'initial', priority);
>+                return element.style.getPropertyValue(propertyName) == 'initial';
>+            }
>+
>+            function canRemoveProperty(propertyName) {
>+                element.style.removeProperty(propertyName);
>+                return element.style.getPropertyValue(propertyName) != 'initial';
>+            }
>+
>+            for (i = 0; i < shorthandProperties.length; ++i) {
>+                var propertyName = shorthandProperties[i];
>+
>+                test(function(){
>+                    assert_true(canSetProperty(propertyName, ''), 'can setPropertyValue with shorthand');
>+                }, 'shorthand ' + propertyName + ' can be set with setProperty');
>+
>+                test(function(){
>+                    assert_true(canRemoveProperty(propertyName), 'can setPropertyValue with shorthand');
>+                }, 'shorthand ' + propertyName + ' can be removed with removeProperty');
>+
>+                test(function(){
>+                    assert_true(canSetProperty(propertyName, 'important'), 'can setPropertyValue with shorthand');
>+                }, 'shorthand ' + propertyName + ' can be set with setProperty and priority !important');
>+
>+                test(function(){
>+                    assert_true(canRemoveProperty(propertyName), 'can setPropertyValue with shorthand');
>+                }, 'shorthand ' + propertyName + ' can be removed with removeProperty even when set with !important');
>+
>+            }
>+        </script>
>+    </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..81e9efeb8ac663743caa1c77f38fdfb3c9f7d229
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>@@ -0,0 +1,10 @@
>+
>+PASS uppercase property 
>+PASS uppercase value 
>+PASS overwriting with invalid value 
>+PASS use rgb 
>+PASS cssText order 
>+PASS another cssText order (non-alphabetical order) 
>+PASS whitespaces in value 
>+PASS invalid property does not appear 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-final-delimiter-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-final-delimiter-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..e1e40e31226866578a972642850e254eaf56d108
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-final-delimiter-expected.txt
>@@ -0,0 +1,5 @@
>+
>+PASS inline style - text - delimiters - zero declarations 
>+PASS inline style - text - delimiters - one declaration 
>+PASS inline style - text - delimiters - two declarations 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-final-delimiter.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-final-delimiter.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..d6ec9ff7ee6c171ddee02b8ded05cc61732447cf
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-final-delimiter.html
>@@ -0,0 +1,32 @@
>+<!DOCTYPE html>
>+<html>
>+  <head>
>+    <title>CSSOM - CSSStyleDeclaration - Text - Serialization - Delimiters</title>
>+    <link rel="author" title="Glenn Adams" href="mailto:glenn@skynav.com"/>
>+    <link rel="help" href="https://drafts.csswg.org/cssom/#the-cssstyledeclaration-interface"/>
>+    <meta name="flags" content="dom"/>
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+  </head>
>+  <body>
>+    <div id="box"></div>
>+    <script>
>+      var style = document.getElementById('box').style;
>+
>+      test(function(){
>+        style.cssText = "";
>+        assert_equals(style.cssText, "");
>+      }, 'inline style - text - delimiters - zero declarations');
>+
>+      test(function(){
>+        style.cssText = "left: 10px";
>+        assert_equals(style.cssText, "left: 10px;");
>+      }, 'inline style - text - delimiters - one declaration');
>+
>+      test(function(){
>+        style.cssText = "left: 10px; right: 20px";
>+        assert_equals(style.cssText, "left: 10px; right: 20px;");
>+      }, 'inline style - text - delimiters - two declarations');
>+    </script>
>+  </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-important-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-important-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..7fdbfee8725a461472f341c75fd140214baf8de5
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-important-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS padding-left should be taken from the !important property 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-important.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-important.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..07935c845403da93636abd3ef209269f31ca5e53
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-important.html
>@@ -0,0 +1,12 @@
>+<title>CSSOM test: setting a property with cssText and !important</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom-1/#dom-cssstyledeclaration-csstext">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<div id="box"></div>
>+<script>
>+  var style = document.getElementById('box').style;
>+  test(function(){
>+      style.cssText = "padding: 10px !important; padding-left: 20px;";
>+      assert_equals(style.getPropertyValue("padding-left"), "10px");
>+  }, "padding-left should be taken from the !important property");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..1284df3e003271967942f23f717777c725634dee
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext.html
>@@ -0,0 +1,102 @@
>+<!DOCTYPE html>
>+<html>
>+    <head>
>+        <title>CSSOM Test: CSSStyleDeclaration.cssText Test</title>
>+        <link rel="author" title="kkoichi" href="mailto:coarse.ground@gmail.com">
>+        <link rel="reviewer" title="Simon Pieters" href="mailto:simonp@opera.com">
>+        <link rel="help" href="https://drafts.csswg.org/cssom-1/#dom-cssstyledeclaration-csstext">
>+        <meta name="assert" content="CSS declarations is serialized as expected">
>+        <meta name="flags" content="dom">
>+        <script src="../../../../../resources/testharness.js"></script>
>+        <script src="../../../../../resources/testharnessreport.js"></script>
>+    </head>
>+    <body>
>+    <div id="log"></div>
>+    <script>
>+        function newElm() {
>+            return document.body.appendChild(document.createElement('div'));
>+        }
>+
>+        test(function(){
>+            var style = newElm().style;
>+            style.COLOR = 'red';
>+
>+            assert_equals(style.cssText, '');
>+
>+        }, 'uppercase property');
>+
>+        test(function(){
>+            var style = newElm().style;
>+            style.color = 'RED';
>+
>+            // https://www.w3.org/Bugs/Public/show_bug.cgi?id=29317
>+            assert_any(assert_equals, style.cssText, ['color: red;', 'color: RED;']);
>+
>+        }, 'uppercase value');
>+
>+        test(function(){
>+            var style = newElm().style;
>+
>+            style.color = 'red';
>+
>+            style.color = 'unknown color';
>+
>+            assert_equals(style.cssText, 'color: red;');
>+
>+        }, 'overwriting with invalid value');
>+
>+        test(function(){
>+            var style = newElm().style;
>+            style.color = 'rgb(255, 0, 0)';
>+
>+            assert_equals(style.cssText, 'color: rgb(255, 0, 0);');
>+
>+        }, 'use rgb');
>+
>+        test(function(){
>+            var e = newElm();
>+            var style = e.style;
>+
>+            style.color = 'red';
>+            style.fontSize = '10pt';
>+            style.fontWeight = 'bold';
>+
>+            assert_equals(style.cssText, 'color: red; font-size: 10pt; font-weight: bold;');
>+
>+        }, 'cssText order');
>+
>+        test(function(){
>+            var e = newElm();
>+            var style = e.style;
>+
>+            style.fontWeight = 'bold';
>+            style.color = 'red';
>+            style.fontSize = '10pt';
>+
>+            assert_equals(style.cssText, 'font-weight: bold; color: red; font-size: 10pt;');
>+
>+        }, 'another cssText order (non-alphabetical order)');
>+
>+        test(function(){
>+            var style = newElm().style;
>+
>+            style.color = '   red';
>+            style.fontSize = '10pt   ';
>+
>+            assert_equals(style.cssText, 'color: red; font-size: 10pt;');
>+
>+        }, 'whitespaces in value');
>+
>+        test(function(){
>+            var style = newElm().style;
>+
>+            style.color = 'red';
>+            style.unknown = 'unknown';
>+            style.fontSize = '10pt';
>+            assert_equals(style.cssText, 'color: red; font-size: 10pt;');
>+
>+        }, 'invalid property does not appear');
>+
>+    </script>
>+    </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutability-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutability-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..c64766ad6509e1acc75e07a3e9705ea3f635bedf
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutability-expected.txt
>@@ -0,0 +1,5 @@
>+
>+PASS HTMLElement's CSSStyleDeclaration is mutable 
>+PASS getComputedStyle's CSSStyleDeclaration is not mutable 
>+PASS StyleSheet's CSSStyleDeclaration is mutable 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutability.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutability.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..2661793f3283a9dcbf60698a4b26fbdbbb242840
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutability.html
>@@ -0,0 +1,69 @@
>+<!DOCTYPE html>
>+<html>
>+    <head>
>+        <title>CSSOM: CSSStyleDeclaration is mutable and immutable in various settings</title>
>+        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
>+        <link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> 
>+        <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
>+
>+        <meta name="flags" content="dom">
>+
>+        <script src="../../../../../resources/testharness.js"></script>
>+        <script src="../../../../../resources/testharnessreport.js"></script>
>+    </head>
>+
>+    <body>
>+        <div id="log"></div>
>+        <div id="box"></box>
>+        <div id="box2"></box>
>+        <style id="teststyles">
>+            #box2 { width: 15px; }
>+        </style>
>+        <script>
>+
>+            test(function(){
>+                var elem = document.getElementById('box');
>+
>+                elem.style.width = '10px';
>+                assert_equals(elem.style.width, '10px', 'setting via style property');
>+                elem.style.width = '';
>+
>+                elem.style.cssText = 'width: 10px';
>+                assert_equals(elem.style.width, '10px', 'setting via cssText');
>+                elem.style.width = '';
>+
>+            }, 'HTMLElement\'s CSSStyleDeclaration is mutable')
>+
>+
>+            test(function(){
>+                var elem = document.getElementById('box');
>+                var style = getComputedStyle(elem, 'width');
>+
>+                assert_throws('NO_MODIFICATION_ALLOWED_ERR', function(){
>+                    style.width = '10px';
>+                });
>+
>+            }, 'getComputedStyle\'s CSSStyleDeclaration is not mutable')
>+
>+
>+            test(function(){
>+
>+                var style = document.getElementById('teststyles').sheet.cssRules[0].style;
>+
>+                assert_equals(style.width, '15px', 'width value is correct');
>+
>+                style.width = '25px';
>+
>+                assert_equals(style.width, '25px', 'width value is mutable');
>+
>+                var gCSstyle = getComputedStyle(document.getElementById('box2'));
>+
>+                assert_equals(gCSstyle.width, '25px', 'styleSheet change is live and accesible via getComputedStyle');
>+
>+            }, 'StyleSheet\'s CSSStyleDeclaration is mutable');
>+
>+
>+        </script>
>+
>+    </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-001-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-001-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..5eacaa76ef82ba261054e2468167cac239484745
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-001-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS CSSStyleDeclaration.setPropertyValue queues a mutation record, even if not mutated 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-001.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-001.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..2df90c7194bec34f8ea276ffd4b4a85edd33b64d
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-001.html
>@@ -0,0 +1,20 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>CSSOM: CSSStyleDeclaration.setPropertyValue queues a mutation record when not actually mutated</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-setpropertyvalue">
>+<link rel="help" href="https://drafts.csswg.org/cssom/#update-style-attribute-for">
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@crisal.io">
>+<script src=../../../../../resources/testharness.js></script>
>+<script src=../../../../../resources/testharnessreport.js></script>
>+<script>
>+  document.documentElement.style.top = "0px";
>+
>+  let test = async_test("CSSStyleDeclaration.setPropertyValue queues a mutation record, even if not mutated");
>+  let m = new MutationObserver(function(r) {
>+    assert_equals(r.length, 1);
>+    test.done();
>+  });
>+
>+  m.observe(document.documentElement,  { attributes: true });
>+  document.documentElement.style.top = "0px";
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-002-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-002-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..2f985b3f5b42accdde4409d0cf4499cc964f9d1f
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-002-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS CSSStyleDeclaration.setPropertyValue doesn't queue a mutation record when setting invalid values 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-002.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-002.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..3b8aa2dfa49b42585b66f8ccf89223042fe6b5c0
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-002.html
>@@ -0,0 +1,15 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>CSSOM: CSSStyleDeclaration.setPropertyValue doesn't queue a mutation record for invalid values</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-setpropertyvalue">
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@crisal.io">
>+<script src=../../../../../resources/testharness.js></script>
>+<script src=../../../../../resources/testharnessreport.js></script>
>+<script>
>+  let test = async_test("CSSStyleDeclaration.setPropertyValue doesn't queue a mutation record when setting invalid values");
>+  let m = new MutationObserver(test.unreached_func("shouldn't queue a mutation record"));
>+  m.observe(document.documentElement,  { attributes: true });
>+
>+  document.documentElement.style.width = "-100px";
>+  requestAnimationFrame(() => test.done());
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-003-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-003-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..984876b25d634049af33a90f615efb861274e54f
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-003-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS CSSStyleDeclaration.removeProperty doesn't queue a mutation record when not actually removed, invoked from setPropertyValue 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-003.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-003.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..da74fac38eb9b0e60591d0de3ee8943f7de5c869
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-003.html
>@@ -0,0 +1,16 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>CSSOM: CSSStyleDeclaration.removeProperty doesn't queue a mutation record when not actually removed, invoked from setPropertyValue</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-setpropertyvalue">
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@crisal.io">
>+<script src=../../../../../resources/testharness.js></script>
>+<script src=../../../../../resources/testharnessreport.js></script>
>+<script>
>+  let test = async_test("CSSStyleDeclaration.removeProperty doesn't queue a mutation record when not actually removed, invoked from setPropertyValue");
>+  document.documentElement.style.top = "0";
>+  let m = new MutationObserver(test.unreached_func("shouldn't queue a mutation record"));
>+  m.observe(document.documentElement,  { attributes: true });
>+
>+  document.documentElement.style.width = "";
>+  requestAnimationFrame(() => test.done());
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-004-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-004-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..ce5a911a24d48416465e1f85946f768ef3d400cd
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-004-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS CSSStyleDeclaration.removeProperty doesn't queue a mutation record when not actually removed 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-004.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-004.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..8e7d308c890fc6065816aed8040c9816a4751b06
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-004.html
>@@ -0,0 +1,16 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>CSSOM: CSSStyleDeclaration.removeProperty doesn't queue a mutation record when not actually removed</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-setpropertyvalue">
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@crisal.io">
>+<script src=../../../../../resources/testharness.js></script>
>+<script src=../../../../../resources/testharnessreport.js></script>
>+<script>
>+  let test = async_test("CSSStyleDeclaration.removeProperty doesn't queue a mutation record when not actually removed");
>+  document.documentElement.style.top = "0";
>+  let m = new MutationObserver(test.unreached_func("shouldn't queue a mutation record"));
>+  m.observe(document.documentElement,  { attributes: true });
>+
>+  document.documentElement.style.removeProperty("width");
>+  requestAnimationFrame(() => test.done());
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-setter-order-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-setter-order-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..057696adbf58c102e8bb93b120c6ec6dc692137b
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-setter-order-expected.txt
>@@ -0,0 +1,6 @@
>+
>+PASS setProperty with existing longhand should change order 
>+PASS invoke property setter with existing longhand should change order 
>+PASS setProperty with existing shorthand should change order 
>+PASS invoke property setter with existing shorthand should change order 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-setter-order.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-setter-order.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..8480c8b864eb36c6d75c95038e59b400fbe2565c
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-setter-order.html
>@@ -0,0 +1,108 @@
>+<!DOCTYPE html>
>+<title>CSSOM test: order of declarations after setting via CSSOM</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#set-a-css-declaration-value">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<div id="log"></div>
>+<script>
>+  function generateCSSDeclBlock(props) {
>+    let elem = document.createElement("div");
>+    let cssText = props.map(([prop, value]) => `${prop}: ${value};`).join(" ");
>+    elem.setAttribute("style", cssText);
>+    return elem.style;
>+  }
>+  function checkOrder(block, props, msg) {
>+    assert_array_equals(Array.from(block), props, `Property order should match ${msg}`);
>+  }
>+  function arrayWithItemsAtEnd(array, items) {
>+    let result = array.filter(item => !items.includes(item));
>+    return result.concat(items);
>+  }
>+
>+  const SUBPROPS = {
>+    "margin": ["margin-top", "margin-right", "margin-bottom", "margin-left"],
>+    "padding": ["padding-top", "padding-right", "padding-bottom", "padding-left"],
>+  };
>+
>+  test(function() {
>+    let block = generateCSSDeclBlock([
>+      ["top", "1px"],
>+      ["bottom", "2px"],
>+      ["left", "3px"],
>+      ["right", "4px"],
>+    ]);
>+    let expectedOrder = ["top", "bottom", "left", "right"];
>+    checkOrder(block, expectedOrder, "in initial block");
>+
>+    block.setProperty("top", "5px");
>+    expectedOrder = arrayWithItemsAtEnd(expectedOrder, ["top"]);
>+    checkOrder(block, expectedOrder, "after setting existing property");
>+
>+    block.setProperty("bottom", "2px");
>+    expectedOrder = arrayWithItemsAtEnd(expectedOrder, ["bottom"]);
>+    checkOrder(block, expectedOrder, "after setting existing property with identical value");
>+  }, "setProperty with existing longhand should change order");
>+
>+  test(function() {
>+    let block = generateCSSDeclBlock([
>+      ["top", "1px"],
>+      ["bottom", "2px"],
>+      ["left", "3px"],
>+      ["right", "4px"],
>+    ]);
>+    let expectedOrder = ["top", "bottom", "left", "right"];
>+    checkOrder(block, expectedOrder, "in initial block");
>+
>+    block.top = "5px";
>+    expectedOrder = arrayWithItemsAtEnd(expectedOrder, ["top"]);
>+    checkOrder(block, expectedOrder, "after setting existing property");
>+
>+    block.bottom = "2px";
>+    expectedOrder = arrayWithItemsAtEnd(expectedOrder, ["bottom"]);
>+    checkOrder(block, expectedOrder, "after setting existing property with identical value");
>+  }, "invoke property setter with existing longhand should change order");
>+
>+  test(function() {
>+    let block = generateCSSDeclBlock([
>+      ["margin", "1px"],
>+      ["top", "2px"],
>+      ["padding", "3px"],
>+    ]);
>+    let expectedOrder = SUBPROPS["margin"].concat(["top"]).concat(SUBPROPS["padding"]);
>+    checkOrder(block, expectedOrder, "in initial block");
>+
>+    block.setProperty("margin", "4px");
>+    expectedOrder = arrayWithItemsAtEnd(expectedOrder, SUBPROPS["margin"]);
>+    checkOrder(block, expectedOrder, "after setting an existing shorthand");
>+
>+    block.setProperty("padding", "3px");
>+    expectedOrder = arrayWithItemsAtEnd(expectedOrder, SUBPROPS["padding"]);
>+    checkOrder(block, expectedOrder, "after setting an existing shorthand with identical value");
>+
>+    block.setProperty("margin-bottom", "5px");
>+    expectedOrder = arrayWithItemsAtEnd(expectedOrder, ["margin-bottom"]);
>+    checkOrder(block, expectedOrder, "after setting a longhand in an existing shorthand");
>+  }, "setProperty with existing shorthand should change order");
>+
>+  test(function() {
>+    let block = generateCSSDeclBlock([
>+      ["margin", "1px"],
>+      ["top", "2px"],
>+      ["padding", "3px"],
>+    ]);
>+    let expectedOrder = SUBPROPS["margin"].concat(["top"]).concat(SUBPROPS["padding"]);
>+    checkOrder(block, expectedOrder, "in initial block");
>+
>+    block.margin = "4px";
>+    expectedOrder = arrayWithItemsAtEnd(expectedOrder, SUBPROPS["margin"]);
>+    checkOrder(block, expectedOrder, "after setting an existing shorthand");
>+
>+    block.padding = "3px";
>+    expectedOrder = arrayWithItemsAtEnd(expectedOrder, SUBPROPS["padding"]);
>+    checkOrder(block, expectedOrder, "after setting an existing shorthand with identical value");
>+
>+    block.marginBottom = "5px";
>+    expectedOrder = arrayWithItemsAtEnd(expectedOrder, ["margin-bottom"]);
>+    checkOrder(block, expectedOrder, "after setting a longhand in an existing shorthand");
>+  }, "invoke property setter with existing shorthand should change order");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/escape-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/escape-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..76ee47af3b06ba5398dd33d70e7313675ddd184b
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/escape-expected.txt
>@@ -0,0 +1,12 @@
>+
>+PASS Number of arguments 
>+PASS String conversion 
>+PASS Null bytes 
>+PASS Replacement character 
>+PASS Number prefix 
>+PASS Letter number prefix 
>+PASS Dash number prefix 
>+PASS Double dash prefix 
>+PASS Various tests 
>+PASS Surrogates 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/escape.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/escape.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..6e9a16a2ab30c6e84175252ecf599e0cd897d534
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/escape.html
>@@ -0,0 +1,98 @@
>+<!doctype html>
>+<meta charset=utf-8>
>+<title>CSS#escape</title>
>+<link rel=help href=https://drafts.csswg.org/cssom-1/#the-css.escape()-method>
>+<script src=../../../../../resources/testharness.js></script>
>+<script src=../../../../../resources/testharnessreport.js></script>
>+<div id=log></div>
>+<script>
>+test(function() {
>+  assert_equals(CSS.escape.length, 1);
>+  assert_throws(new TypeError(), function() { CSS.escape(); });
>+}, "Number of arguments");
>+
>+test(function() {
>+  assert_equals(CSS.escape(true), 'true');
>+  assert_equals(CSS.escape(false), 'false');
>+  assert_equals(CSS.escape(null), 'null');
>+  assert_equals(CSS.escape(''), '');
>+}, "String conversion");
>+
>+test(function() {
>+  assert_equals(CSS.escape('\0'), '\uFFFD');
>+  assert_equals(CSS.escape('a\0'), 'a\uFFFD');
>+  assert_equals(CSS.escape('\0b'), '\uFFFDb');
>+  assert_equals(CSS.escape('a\0b'), 'a\uFFFDb');
>+}, "Null bytes");
>+
>+test(function() {
>+  assert_equals(CSS.escape('\uFFFD'), '\uFFFD');
>+  assert_equals(CSS.escape('a\uFFFD'), 'a\uFFFD');
>+  assert_equals(CSS.escape('\uFFFDb'), '\uFFFDb');
>+  assert_equals(CSS.escape('a\uFFFDb'), 'a\uFFFDb');
>+}, "Replacement character");
>+
>+test(function() {
>+  assert_equals(CSS.escape('0a'), '\\30 a');
>+  assert_equals(CSS.escape('1a'), '\\31 a');
>+  assert_equals(CSS.escape('2a'), '\\32 a');
>+  assert_equals(CSS.escape('3a'), '\\33 a');
>+  assert_equals(CSS.escape('4a'), '\\34 a');
>+  assert_equals(CSS.escape('5a'), '\\35 a');
>+  assert_equals(CSS.escape('6a'), '\\36 a');
>+  assert_equals(CSS.escape('7a'), '\\37 a');
>+  assert_equals(CSS.escape('8a'), '\\38 a');
>+  assert_equals(CSS.escape('9a'), '\\39 a');
>+}, "Number prefix");
>+
>+test(function() {
>+  assert_equals(CSS.escape('a0b'), 'a0b');
>+  assert_equals(CSS.escape('a1b'), 'a1b');
>+  assert_equals(CSS.escape('a2b'), 'a2b');
>+  assert_equals(CSS.escape('a3b'), 'a3b');
>+  assert_equals(CSS.escape('a4b'), 'a4b');
>+  assert_equals(CSS.escape('a5b'), 'a5b');
>+  assert_equals(CSS.escape('a6b'), 'a6b');
>+  assert_equals(CSS.escape('a7b'), 'a7b');
>+  assert_equals(CSS.escape('a8b'), 'a8b');
>+  assert_equals(CSS.escape('a9b'), 'a9b');
>+}, "Letter number prefix");
>+
>+test(function() {
>+  assert_equals(CSS.escape('-0a'), '-\\30 a');
>+  assert_equals(CSS.escape('-1a'), '-\\31 a');
>+  assert_equals(CSS.escape('-2a'), '-\\32 a');
>+  assert_equals(CSS.escape('-3a'), '-\\33 a');
>+  assert_equals(CSS.escape('-4a'), '-\\34 a');
>+  assert_equals(CSS.escape('-5a'), '-\\35 a');
>+  assert_equals(CSS.escape('-6a'), '-\\36 a');
>+  assert_equals(CSS.escape('-7a'), '-\\37 a');
>+  assert_equals(CSS.escape('-8a'), '-\\38 a');
>+  assert_equals(CSS.escape('-9a'), '-\\39 a');
>+}, "Dash number prefix");
>+
>+test(function() {
>+  assert_equals(CSS.escape('--a'), '--a');
>+}, "Double dash prefix");
>+
>+test(function() {
>+  assert_equals(CSS.escape('\x01\x02\x1E\x1F'), '\\1 \\2 \\1e \\1f ');
>+
>+  assert_equals(CSS.escape('\x80\x2D\x5F\xA9'), '\x80\x2D\x5F\xA9');
>+  assert_equals(CSS.escape('\x7F\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8A\x8B\x8C\x8D\x8E\x8F\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9A\x9B\x9C\x9D\x9E\x9F'), '\\7f \x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8A\x8B\x8C\x8D\x8E\x8F\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9A\x9B\x9C\x9D\x9E\x9F');
>+  assert_equals(CSS.escape('\xA0\xA1\xA2'), '\xA0\xA1\xA2');
>+  assert_equals(CSS.escape('a0123456789b'), 'a0123456789b');
>+  assert_equals(CSS.escape('abcdefghijklmnopqrstuvwxyz'), 'abcdefghijklmnopqrstuvwxyz');
>+  assert_equals(CSS.escape('ABCDEFGHIJKLMNOPQRSTUVWXYZ'), 'ABCDEFGHIJKLMNOPQRSTUVWXYZ');
>+
>+  assert_equals(CSS.escape('\x20\x21\x78\x79'), '\\ \\!xy');
>+}, "Various tests");
>+
>+test(function() {
>+  // astral symbol (U+1D306 TETRAGRAM FOR CENTRE)
>+  assert_equals(CSS.escape('\uD834\uDF06'), '\uD834\uDF06');
>+  // lone surrogates
>+  assert_equals(CSS.escape('\uDF06'), '\uDF06');
>+  assert_equals(CSS.escape('\uD834'), '\uD834');
>+}, "Surrogates");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/font-shorthand-serialization-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/font-shorthand-serialization-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..d558498ef8f52b4834c29e494174fa78eff570a1
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/font-shorthand-serialization-expected.txt
>@@ -0,0 +1,3 @@
>+
>+FAIL The font shorthand should be serialized just like any other shorthand. assert_equals: expected "font: 10px/1 Ahem;" but got "font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 10px; line-height: 1; font-family: Ahem;"
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/font-shorthand-serialization.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/font-shorthand-serialization.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..b372175b28a43c0d4028ea3eeb3b257ec1d67cdf
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/font-shorthand-serialization.html
>@@ -0,0 +1,16 @@
>+<!doctype html>
>+<html>
>+<meta charset="utf-8">
>+<title>Serialization of font shorthand</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom-1/#serialize-a-css-declaration-block">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<div id="target" style="font: 10px/1 Ahem;"></div>
>+<script>
>+    test(function() {
>+        var target = document.getElementById('target');
>+        assert_equals(target.style.cssText, 'font: 10px/1 Ahem;');
>+        assert_equals(target.style.font, '10px/1 Ahem');
>+    }, "The font shorthand should be serialized just like any other shorthand.");
>+</script>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-detached-subtree-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-detached-subtree-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..6d449d84f85ee88cc30f59f4923eb2d47cd5dfd5
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-detached-subtree-expected.txt
>@@ -0,0 +1,7 @@
>+
>+PASS getComputedStyle returns no style for detached element 
>+FAIL getComputedStyle returns no style for element in non-rendered iframe (display: none) assert_equals: expected 0 but got 320
>+FAIL getComputedStyle returns no style for element outside the flat tree assert_equals: expected 0 but got 316
>+FAIL getComputedStyle returns no style for descendant outside the flat tree assert_equals: expected 0 but got 316
>+PASS getComputedStyle returns no style for shadow tree outside of flattened tree 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-detached-subtree.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-detached-subtree.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..66387cebafe8b693247d8e228da9021c0f951b88
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-detached-subtree.html
>@@ -0,0 +1,44 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>CSSOM: getComputedStyle returns no style for elements not in the tree</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#dom-window-getcomputedstyle">
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@crisal.io">
>+<script src=../../../../../resources/testharness.js></script>
>+<script src=../../../../../resources/testharnessreport.js></script>
>+<div id="host">
>+  <div id="non-slotted">
>+    <div id="non-slotted-descendant"></div>
>+  </div>
>+</div>
>+<iframe srcdoc="<html></html>" style="display: none"></iframe>
>+<script>
>+function testNoComputedStyle(element, description) {
>+  test(function() {
>+    assert_true(!!element);
>+    let style = getComputedStyle(element);
>+    assert_true(!!style);
>+    assert_equals(style.length, 0);
>+    assert_equals(style.color, "");
>+  }, `getComputedStyle returns no style for ${description}`);
>+}
>+
>+let detached = document.createElement('div');
>+testNoComputedStyle(detached, "detached element");
>+
>+testNoComputedStyle(document.querySelector('iframe').contentDocument.documentElement,
>+                    "element in non-rendered iframe (display: none)");
>+
>+host.attachShadow({ mode: "open" });
>+testNoComputedStyle(document.getElementById('non-slotted'),
>+                    "element outside the flat tree");
>+
>+testNoComputedStyle(document.getElementById('non-slotted-descendant'),
>+                    "descendant outside the flat tree");
>+
>+let shadowRoot = detached.attachShadow({ mode: "open" });
>+shadowRoot.innerHTML = `
>+  <div id="detached-shadow-tree-descendant"></div>
>+`;
>+testNoComputedStyle(shadowRoot.getElementById('detached-shadow-tree-descendant'),
>+                    "shadow tree outside of flattened tree");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-dynamic-subdoc-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-dynamic-subdoc-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..b990bb3fbfe14e674ba919aa11dbde3b230611a1
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-dynamic-subdoc-expected.txt
>@@ -0,0 +1,4 @@
>+
>+
>+PASS getComputedStyle cross-doc properly reflects media query changes 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-dynamic-subdoc.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-dynamic-subdoc.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..46d91320d19d88f3983ec80d9282131d96fd934b
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-dynamic-subdoc.html
>@@ -0,0 +1,33 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>CSSOM: getComputedStyle cross-doc properly reflects media query changes</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#dom-window-getcomputedstyle">
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@crisal.io">
>+<script src=../../../../../resources/testharness.js></script>
>+<script src=../../../../../resources/testharnessreport.js></script>
>+<iframe id="frm" style="width: 100px; height: 100px"></iframe>
>+<script>
>+test(function() {
>+  let frm = document.getElementById('frm');
>+  let frmDoc = frm.contentWindow.document;
>+  frmDoc.open();
>+  frmDoc.write('<style>body { color: red } @media all and (min-width: 101px) { body { color: green } }</style><body>Should be green</body>');
>+  frmDoc.close();
>+
>+  document.body.offsetTop;
>+
>+  assert_equals(
>+    getComputedStyle(frmDoc.body).color,
>+    "rgb(255, 0, 0)",
>+    "Initial color should be red"
>+  );
>+
>+  frm.style.width = "200px";
>+
>+  assert_equals(
>+    getComputedStyle(frmDoc.body).color,
>+    "rgb(0, 128, 0)",
>+    "style should have been updated to account for media query changes"
>+  );
>+}, "getComputedStyle cross-doc properly reflects media query changes");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-pseudo-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-pseudo-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..0d5545d1b7a27a33983b134cc455f8d5ee966924
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-pseudo-expected.txt
>@@ -0,0 +1,10 @@
>+
>+PASS Resolution of width is correct for ::before and ::after pseudo-elements 
>+PASS Resolution of width is correct for ::before and ::after pseudo-elements of display: contents elements 
>+PASS Resolution of nonexistent pseudo-element styles 
>+FAIL Resolution of pseudo-element styles in display: none elements assert_equals: Pseudo-styles of display: none elements should be correct expected "\"Foo\"" but got "Foo"
>+PASS Item-based blockification of pseudo-elements 
>+FAIL Item-based blockification of nonexistent pseudo-elements assert_equals: Pseudo-styles of display: flex elements should get blockified expected "block" but got "inline"
>+PASS display: contents on pseudo-elements 
>+FAIL Unknown pseudo-elements throw assert_throws: getComputedStyle with an unknown pseudo-element throws function "() => getComputedStyle(div, "totallynotapseudo")" did not throw
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-pseudo.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-pseudo.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..f95341a489717cb724b257abe079b582d0a5e6bb
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-pseudo.html
>@@ -0,0 +1,117 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>CSSOM: Correct resolution of resolved value for display-affected pseudo-elements</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#dom-window-getcomputedstyle">
>+<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-values">
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@crisal.io">
>+<script src=../../../../../resources/testharness.js></script>
>+<script src=../../../../../resources/testharnessreport.js></script>
>+<style>
>+#test { width: 100px; }
>+
>+#contents {
>+  display: contents;
>+  border: 10px solid red;
>+}
>+
>+#test::before,
>+#test::after,
>+#contents::before,
>+#contents::after,
>+#flex::before,
>+#flex::after {
>+  content: " ";
>+  width: 50%;
>+  height: 10px;
>+  display: block;
>+}
>+#none {
>+  display: none;
>+}
>+#none::before,
>+#none::after {
>+  content: "Foo";
>+}
>+#flex {
>+  display: flex;
>+}
>+#flex-no-pseudo {
>+  display: flex;
>+}
>+#contents-pseudos::before,
>+#contents-pseudos::after {
>+  display: contents;
>+  content: "foo";
>+  position: absolute;
>+}
>+</style>
>+<div id="test">
>+  <div id="contents"></div>
>+  <div id="none"></div>
>+  <div id="flex"></div>
>+  <div id="flex-no-pseudo"></div>
>+  <div id="contents-pseudos"></div>
>+</div>
>+<script>
>+test(function() {
>+  var div = document.getElementById('test');
>+  [":before", ":after"].forEach(function(pseudo) {
>+    assert_equals(getComputedStyle(div, pseudo).width, "50px");
>+  });
>+}, "Resolution of width is correct for ::before and ::after pseudo-elements");
>+test(function() {
>+  var contents = document.getElementById('contents');
>+  [":before", ":after"].forEach(function(pseudo) {
>+    assert_equals(getComputedStyle(contents, pseudo).width, "50px");
>+  });
>+}, "Resolution of width is correct for ::before and ::after pseudo-elements of display: contents elements");
>+test(function() {
>+  var has_no_pseudos = document.body;
>+  has_no_pseudos.style.position = "relative";
>+  [":before", ":after"].forEach(function(pseudo) {
>+    assert_equals(getComputedStyle(has_no_pseudos, pseudo).position, "static",
>+                  "Nonexistent " + pseudo + " pseudo-element shouldn't claim to have " +
>+                  "the same style as the originating element");
>+    assert_equals(getComputedStyle(has_no_pseudos, pseudo).width, "auto",
>+                  "Nonexistent " + pseudo + " pseudo-element shouldn't claim to have " +
>+                  "definite size");
>+  });
>+}, "Resolution of nonexistent pseudo-element styles");
>+test(function() {
>+  var none = document.getElementById('none');
>+  [":before", ":after"].forEach(function(pseudo) {
>+    assert_equals(getComputedStyle(none, pseudo).content, "\"Foo\"",
>+                  "Pseudo-styles of display: none elements should be correct");
>+  });
>+}, "Resolution of pseudo-element styles in display: none elements");
>+test(function() {
>+  var flex = document.getElementById('flex');
>+  [":before", ":after"].forEach(function(pseudo) {
>+    assert_equals(getComputedStyle(flex, pseudo).display, "block",
>+                  "Pseudo-styles of display: flex elements should get blockified");
>+  });
>+}, "Item-based blockification of pseudo-elements");
>+test(function() {
>+  var flexNoPseudo = document.getElementById('flex-no-pseudo');
>+  [":before", ":after"].forEach(function(pseudo) {
>+    assert_equals(getComputedStyle(flexNoPseudo, pseudo).display, "block",
>+                  "Pseudo-styles of display: flex elements should get blockified");
>+  });
>+}, "Item-based blockification of nonexistent pseudo-elements");
>+test(function() {
>+  var contentsPseudos = document.getElementById('contents-pseudos');
>+  [":before", ":after"].forEach(function(pseudo) {
>+    assert_equals(getComputedStyle(contentsPseudos, pseudo).display, "contents",
>+                  "display: contents in " + pseudo + " should get reflected on CSSOM");
>+    assert_equals(getComputedStyle(contentsPseudos, pseudo).width, "auto",
>+                  pseudo + " with display: contents should have no box");
>+    assert_equals(getComputedStyle(contentsPseudos, pseudo).position, "absolute",
>+                  "display: contents in " + pseudo + " should reflect other non-inherited properties in CSSOM");
>+  });
>+}, "display: contents on pseudo-elements");
>+test(function() {
>+  var div = document.getElementById('test');
>+  assert_throws(new TypeError(), () => getComputedStyle(div, "totallynotapseudo"),
>+                "getComputedStyle with an unknown pseudo-element throws");
>+}, "Unknown pseudo-elements throw");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/historical-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/historical-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..f4341dea16ad0477ac703201003c8e04591742fe
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/historical-expected.txt
>@@ -0,0 +1,13 @@
>+
>+PASS Historical Document member: selectedStyleSheetSet 
>+PASS Historical Document member: lastStyleSheetSet 
>+PASS Historical Document member: preferredStyleSheetSet 
>+PASS Historical Document member: styleSheetSets 
>+PASS Historical Document member: enableStyleSheetsForSet 
>+PASS Historical Document member: selectedStylesheetSet 
>+PASS Historical Document member: preferredStylesheetSet 
>+PASS Historical Element member: cascadedStyle 
>+PASS Historical Element member: defaultStyle 
>+PASS Historical Element member: rawComputedStyle 
>+PASS Historical Element member: usedStyle 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/historical.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/historical.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..496c7d13cb9459502506b357d7cecfd1681ed6c6
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/historical.html
>@@ -0,0 +1,36 @@
>+<!DOCTYPE html>
>+<title>Historical features</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#changes-from-5-december-2013">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<div id=log></div>
>+<script>
>+[
>+  "selectedStyleSheetSet",
>+  "lastStyleSheetSet",
>+  "preferredStyleSheetSet",
>+  "styleSheetSets",
>+  "enableStyleSheetsForSet",
>+  "selectedStylesheetSet",
>+  "preferredStylesheetSet",
>+].forEach(function(name) {
>+  test(function() {
>+    assert_false(name in document);
>+
>+    var doc = document.implementation.createDocument(null, null, null);
>+    assert_false(name in doc);
>+  }, "Historical Document member: " + name);
>+});
>+
>+[
>+  "cascadedStyle",
>+  "defaultStyle",
>+  "rawComputedStyle",
>+  "usedStyle",
>+].forEach(function(name) {
>+  test(function() {
>+    assert_false(name in document.body);
>+    assert_false(name in document.createElement("test"));
>+  }, "Historical Element member: " + name);
>+});
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/inline-style-001-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/inline-style-001-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..2f6e4fd96d0cf85254799ebc595abefe125f63b5
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/inline-style-001-expected.txt
>@@ -0,0 +1,7 @@
>+
>+PASS CSSStyleDeclaration_accessible 
>+PASS read 
>+PASS csstext_write 
>+PASS property_write 
>+PASS shorthand_properties 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/inline-style-001.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/inline-style-001.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..0d8485410bc26af3fa5fceac33cd39325586e7c1
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/inline-style-001.html
>@@ -0,0 +1,83 @@
>+<!DOCTYPE html>
>+<html>
>+ <head>
>+  <title>CSS Test: Inline CSSStyleDeclaration</title>
>+  <link rel="author" title="Bear Travis" href="mailto:betravis@adobe.com">
>+  <link rel="help" href="http://www.w3.org/TR/cssom-1/#elementcssinlinestyle">
>+  <meta name="flags" content="dom">
>+  <meta name="assert" content="Inline CSSStyleDeclaration is properly initialized and can be modified through its interface">
>+  <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+  <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+ </head>
>+ <body>
>+ <noscript>Test not run - javascript required.</noscript>
>+ <div id="log"></div>
>+ <div id="test" style="margin-left: 5px;"></div>
>+ <script type="text/javascript">
>+    test(function() {
>+        var test = document.getElementById("test");
>+        assert_idl_attribute(test, "style");
>+        declaration = test.style;
>+    }, "CSSStyleDeclaration_accessible", {
>+        assert: "Can access CSSStyleDeclaration through style property"
>+    });
>+
>+    test(function() {
>+        assert_equals(declaration.cssText, "margin-left: 5px;");
>+        assert_equals(declaration.getPropertyValue("margin-left"), "5px");
>+    }, "read", {
>+        assert: "initial property values are correct"
>+    });
>+
>+    test(function() {
>+        declaration.cssText = "margin-left: 10px; padding-left: 10px;";
>+        assert_equals(declaration.cssText, "margin-left: 10px; padding-left: 10px;");
>+        assert_equals(declaration.length, 2);
>+        assert_equals(declaration.item(0), "margin-left");
>+        assert_equals(declaration.item(1), "padding-left");
>+        assert_equals(declaration.getPropertyValue("margin-left"), "10px");
>+        assert_equals(declaration.getPropertyValue("padding-left"), "10px");
>+
>+        var computedStyle = window.getComputedStyle(document.getElementById("test"));
>+        assert_equals(computedStyle.getPropertyValue("margin-left"), "10px");
>+        assert_equals(computedStyle.getPropertyValue("padding-left"), "10px");
>+    }, "csstext_write", {
>+        assert: [ "setting cssText adds new properties",
>+                "setting cssText removes existing properties",
>+                "properties set through cssText are reflected in the computed style"]
>+    });
>+
>+    test(function() {
>+        while(declaration.length > 0)
>+            declaration.removeProperty(declaration.item(0));
>+        declaration.setProperty("margin-left", "15px");
>+        declaration.setProperty("padding-left", "15px");
>+
>+        assert_equals(declaration.length, 2);
>+        assert_equals(declaration.item(0), "margin-left");
>+        assert_equals(declaration.item(1), "padding-left");
>+        assert_equals(declaration.getPropertyValue("margin-left"), "15px");
>+        assert_equals(declaration.getPropertyValue("padding-left"), "15px");
>+
>+        var computedStyle = window.getComputedStyle(document.getElementById("test"));
>+        assert_equals(computedStyle.getPropertyValue("margin-left"), "15px");
>+        assert_equals(computedStyle.getPropertyValue("padding-left"), "15px");
>+    }, "property_write", {
>+        assert: [ "setProperty adds new properties",
>+                "properties set through setProperty are reflected in the computed style"]
>+    });
>+
>+    test(function() {
>+        while(declaration.length > 0)
>+            declaration.removeProperty(declaration.item(0));
>+        declaration.cssText = "margin: 20px";
>+        assert_equals(declaration.getPropertyValue("margin-top"), "20px");
>+        assert_equals(declaration.getPropertyValue("margin-right"), "20px");
>+        assert_equals(declaration.getPropertyValue("margin-bottom"), "20px");
>+        assert_equals(declaration.getPropertyValue("margin-left"), "20px");
>+    }, "shorthand_properties", {
>+        assert: "shorthand property is expanded"
>+    });
>+ </script>
>+ </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-charset-no-index-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-charset-no-index-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..c418eec7be3c481edd22a5086a723e274789f1a2
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-charset-no-index-expected.txt
>@@ -0,0 +1,4 @@
>+
>+PASS inserRule with charset and omitted index argument 
>+PASS insertRule with charset and undefined index argument 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-charset-no-index.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-charset-no-index.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..dfa19595e8ec44be7012b47f84211eea79426a1d
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-charset-no-index.html
>@@ -0,0 +1,32 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <title>CSS Test: CSSOM StyleSheet insertRule with charset and omitted second argument</title>
>+    <link rel="author" title="Sendil Kumar N" href="mailto:sendilkumarn.opensource@gmail.com">
>+    <link rel="help" href="https://drafts.csswg.org/cssom/">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>+    <meta name="flags" content="dom">
>+    <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+    <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+    <link rel="stylesheet" type="text/css" href="support/import-charset.css" id="linkElement" >
>+</head>
>+<body>
>+<div id="log"></div>
>+<script type="text/javascript">
>+    var sheet = document.getElementById("linkElement").sheet;
>+    test(function() {
>+        assert_equals(sheet.cssRules.length, 0);
>+        sheet.insertRule("p { color: green; }");
>+        assert_equals(sheet.cssRules.length, 1);
>+        assert_equals(sheet.cssRules.item(0).cssText, "p { color: green; }");
>+    }, "inserRule with charset and omitted index argument");
>+
>+    test(function() {
>+        assert_equals(sheet.cssRules.length, 1);
>+        sheet.insertRule("p { color: yellow; }", undefined);
>+        assert_equals(sheet.cssRules.length, 2);
>+        assert_equals(sheet.cssRules.item(0).cssText, "p { color: yellow; }");
>+    }, "insertRule with charset and undefined index argument");
>+</script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-import-no-index-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-import-no-index-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..3377dee2642c24a2a1d176550c457e0c88f562e9
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-import-no-index-expected.txt
>@@ -0,0 +1,4 @@
>+
>+PASS inserRule with import and omitted index argument 
>+PASS insertRule with import and undefined index argument 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-import-no-index.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-import-no-index.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..39e340d7db1f03a9b93ec8707a360866f1d9da54
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-import-no-index.html
>@@ -0,0 +1,33 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <title>CSS Test: CSSOM StyleSheet insertRule with import and omitted second argument</title>
>+    <link rel="author" title="Sendil Kumar N" href="mailto:sendilkumarn.opensource@gmail.com">
>+    <link rel="help" href="https://drafts.csswg.org/cssom/">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>+    <meta name="flags" content="dom">
>+    <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+    <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+    <style id="styleElement">
>+        @import url("support/a-green.css");
>+    </style>
>+</head>
>+<body>
>+<div id="log"></div>
>+<script type="text/javascript">
>+    var sheet = document.getElementById("styleElement").sheet;
>+    test(function() {
>+        assert_equals(sheet.cssRules.length, 1);
>+        assert_throws("HierarchyRequestError", function() { sheet.insertRule("p { color: green; }"); });
>+        assert_equals(sheet.cssRules.length, 1);
>+    }, "inserRule with import and omitted index argument");
>+
>+    test(function() {
>+        assert_equals(sheet.cssRules.length, 1);
>+        assert_throws("HierarchyRequestError", function() { sheet.insertRule("p { color: yellow; }", undefined); });
>+        assert_equals(sheet.cssRules.length, 1);
>+        assert_equals(sheet.cssRules.item(0).cssText, "@import url(\"support/a-green.css\");");
>+    }, "insertRule with import and undefined index argument");
>+</script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-namespace-no-index-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-namespace-no-index-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..b91fb4e5de93502265928af03684e9d3eb422808
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-namespace-no-index-expected.txt
>@@ -0,0 +1,5 @@
>+
>+PASS inserRule with namespace and omitted index argument 
>+PASS insertRule with namespace and undefined index argument 
>+PASS inserRule with namespace and omitted index argument should insert import 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-namespace-no-index.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-namespace-no-index.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..4e4286d5268231e571cb2ad20a91884df4e586dd
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-namespace-no-index.html
>@@ -0,0 +1,40 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <title>CSS Test: CSSOM StyleSheet insertRule with namespace and omitted second argument</title>
>+    <link rel="author" title="Sendil Kumar N" href="mailto:sendilkumarn.opensource@gmail.com">
>+    <link rel="help" href="https://drafts.csswg.org/cssom/">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>+    <meta name="flags" content="dom">
>+    <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+    <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+    <style id="styleElement">
>+        @namespace svg url(http://servo);
>+        @namespace url(http://servo1);
>+        @namespace svg url("http://servo2");
>+    </style>
>+</head>
>+<body>
>+<div id="log"></div>
>+<script type="text/javascript">
>+    var sheet = document.getElementById("styleElement").sheet;
>+    test(function() {
>+        assert_equals(sheet.cssRules.length, 3);
>+        assert_throws("HierarchyRequestError", function() { sheet.insertRule("p { color: green; }"); });
>+        assert_equals(sheet.cssRules.length, 3);
>+    }, "inserRule with namespace and omitted index argument");
>+
>+    test(function() {
>+        assert_equals(sheet.cssRules.length, 3);
>+        assert_throws("HierarchyRequestError", function() { sheet.insertRule("p { color: yellow; }", undefined); });
>+        assert_equals(sheet.cssRules.length, 3);
>+    }, "insertRule with namespace and undefined index argument");
>+
>+    test(function() {
>+        assert_equals(sheet.cssRules.length, 3);
>+        sheet.insertRule("@import url(\"support/a-green.css\");");
>+        assert_equals(sheet.cssRules.length, 4);
>+    }, "inserRule with namespace and omitted index argument should insert import");
>+</script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-no-index-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-no-index-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..b4107613a781629675dd60204b25acecb5044664
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-no-index-expected.txt
>@@ -0,0 +1,4 @@
>+
>+PASS inserRule with omitted index argument 
>+PASS insertRule with undefined index argument 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-no-index.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-no-index.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..89b930e29932104ab15551e63216f1ed11a74578
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-no-index.html
>@@ -0,0 +1,35 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <title>CSS Test: CSSOM StyleSheet insertRule omitted second argument</title>
>+    <link rel="author" title="Sendil Kumar N" href="mailto:sendilkumarn.opensource@gmail.com">
>+    <link rel="help" href="https://drafts.csswg.org/cssom/">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>+    <meta name="flags" content="dom">
>+    <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+    <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+    <style id="styleElement">
>+        /* An initial style rule to test where the new rule is inserted relative to this one */
>+        nosuchelement { color: red; }
>+    </style>
>+</head>
>+<body>
>+<div id="log"></div>
>+<script type="text/javascript">
>+    var sheet = document.getElementById("styleElement").sheet;
>+    test(function() {
>+        assert_equals(sheet.cssRules.length, 1);
>+        sheet.insertRule("p { color: green; }");
>+        assert_equals(sheet.cssRules.length, 2);
>+        assert_equals(sheet.cssRules.item(0).cssText, "p { color: green; }");
>+    }, "inserRule with omitted index argument");
>+
>+    test(function() {
>+        assert_equals(sheet.cssRules.length, 2);
>+        sheet.insertRule("p { color: yellow; }", undefined);
>+        assert_equals(sheet.cssRules.length, 3);
>+        assert_equals(sheet.cssRules.item(0).cssText, "p { color: yellow; }");
>+    }, "insertRule with undefined index argument");
>+</script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-syntax-error-01-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-syntax-error-01-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..a888a1594c0f03dc9046879494bfe0bfa6a0c713
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-syntax-error-01-expected.txt
>@@ -0,0 +1,5 @@
>+This text should be green.
>+
>+
>+PASS A syntax error in insertRule should throw and not affect the style of the page 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-syntax-error-01.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-syntax-error-01.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..6ccaed8304ca23620989436a34802dd6dd120661
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-syntax-error-01.html
>@@ -0,0 +1,14 @@
>+<!DOCTYPE html>
>+<link rel="help" href="https://drafts.csswg.org/cssom-1/#insert-a-css-rule">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<style>
>+p { color: green; }
>+</style>
>+<p id="test">This text should be green.</p>
>+<script>
>+    test(function() {
>+        assert_throws("SyntaxError", () => document.styleSheets[0].insertRule("p { color: red; } garbage", 1));
>+        assert_equals(getComputedStyle(document.getElementById("test")).color, "rgb(0, 128, 0)");
>+    }, "A syntax error in insertRule should throw and not affect the style of the page");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/interfaces-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/interfaces-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/interfaces.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/interfaces.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..49264c19aaad71befbd6962d2b1d3953531d6b13
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/interfaces.html
>@@ -0,0 +1,97 @@
>+<!doctype html>
>+<meta charset=utf-8>
>+
>+<title>CSSOM automated IDL tests</title>
>+<link rel="author" title="Ms2ger" href="mailto:Ms2ger@gmail.com">
>+<link rel="help" href="https://drafts.csswg.org/cssom-1/#idl-index">
>+<script src=../../../../../resources/testharness.js></script>
>+<script src=../../../../../resources/testharnessreport.js></script>
>+<script src=/resources/WebIDLParser.js></script>
>+<script src=/resources/idlharness.js></script>
>+
>+<style id="styleElement" style="z-index: 0;">
>+@import url("data:text/css,");
>+@namespace x "y";
>+@page { @top-left {} }
>+@media all {}
>+#test { color: green; }
>+</style>
>+
>+<svg id="svgElement" style="height: 0;"></svg>
>+
>+<iframe id="xmlssPiIframe" src="support/xmlss-pi.xhtml" style="display: none;"></iframe>
>+
>+<h1>CSSOM IDL tests</h1>
>+<div id=log></div>
>+
>+<script>
>+"use strict";
>+var style_element, svg_element, xmlss_pi;
>+
>+function doTest([html, dom, uievents, cssom]) {
>+  style_element = document.getElementById('styleElement');
>+  svg_element = document.getElementById('svgElement');
>+  xmlss_pi = document.getElementById('xmlssPiIframe').contentDocument.firstChild;
>+
>+  var idlArray = new IdlArray();
>+  var svg = "interface SVGElement : Element {};";
>+  idlArray.add_untested_idls(html + dom + svg);
>+  idlArray.add_untested_idls(uievents, { only: [
>+    'UIEvent',
>+    'UIEventInit',
>+    'MouseEvent',
>+    'MouseEventInit',
>+    'EventModifierInit'
>+  ]});
>+  idlArray.add_idls(cssom);
>+
>+  idlArray.add_objects({
>+    "Document": ["document", "new Document()"],
>+    "StyleSheetList": ["document.styleSheets"],
>+    "CSSStyleSheet": ["style_element.sheet"],
>+    "MediaList": ["style_element.sheet.media"],
>+    "CSSRuleList": ["style_element.sheet.cssRules"],
>+    "CSSImportRule": ["style_element.sheet.cssRules[0]"],
>+    "CSSNamespaceRule": ["style_element.sheet.cssRules[1]"],
>+    "CSSPageRule": ["style_element.sheet.cssRules[2]"],
>+    "CSSMarginRule": ["style_element.sheet.cssRules[2].cssRules[0]"],
>+    "CSSMediaRule": ["style_element.sheet.cssRules[3]"],
>+    "CSSStyleRule": ["style_element.sheet.cssRules[4]"],
>+    "CSSStyleDeclaration": ["style_element.sheet.cssRules[4].style", // CSSStyleRule
>+                            "style_element.sheet.cssRules[2].style", // CSSPageRule
>+                            "style_element.sheet.cssRules[2].cssRules[0].style", // CSSMarginRule
>+                            "style_element.style", // ElementCSSInlineStyle for HTMLElement
>+                            "svg_element.style", // ElementCSSInlineStyle for SVGElement
>+                            "getComputedStyle(svg_element)"],
>+    "ProcessingInstruction": ["xmlss_pi"],
>+    "Window": ["window"],
>+    "HTMLElement": ["style_element", "document.createElement('unknownelement')"],
>+    "SVGElement": ["svg_element"],
>+  });
>+  idlArray.test();
>+};
>+
>+function fetchData(url) {
>+  return fetch(url).then((response) => response.text());
>+}
>+
>+function waitForLoad() {
>+  return new Promise(function(resolve) {
>+    addEventListener("load", resolve);
>+  });
>+}
>+
>+promise_test(function() {
>+  // Have to wait for onload
>+  return Promise.all([fetchData("/interfaces/html.idl"),
>+                      fetchData("/interfaces/dom.idl"),
>+                      fetchData("/interfaces/uievents.idl"),
>+                      fetchData("/interfaces/cssom.idl"),
>+                      waitForLoad()])
>+                .then(doTest);
>+}, "Test driver");
>+
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-dynamic-001-expected.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-dynamic-001-expected.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..9715b5acb8fad7aae3949d255663c9ad958da932
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-dynamic-001-expected.html
>@@ -0,0 +1,5 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>CSS Test Reference</title>
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@crisal.io">
>+Should not be red.
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-dynamic-001.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-dynamic-001.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..ab9c1345680807867b5c7e0e89c28d8f5d213b51
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-dynamic-001.html
>@@ -0,0 +1,12 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>CSS Test: Dynamic changes to the stylesheet media attributes via CSSOM get reflected</title>
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@crisal.io">
>+<link rel="match" href="medialist-dynamic-001-ref.html">
>+<link rel="help" href="https://drafts.csswg.org/cssom/#dom-medialist-mediatext">
>+<style media="all">* { color: red }</style>
>+Should not be red.
>+<script>
>+  document.body.offsetTop;
>+  document.styleSheets[0].media.mediaText = "not all";
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-001-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-001-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..edef2c27308f5eb7bfadcb31413fcf5ae5e086b0
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-001-expected.txt
>@@ -0,0 +1,6 @@
>+
>+PASS mediatest_medialist_serialize_element 
>+PASS mediatest_medialist_serialize_comma 
>+PASS mediatest_medialist_serialize_empty 
>+PASS mediatest_medialist_serialize_order 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-001.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-001.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..efdb7a9d952f0078481c86b98005fe3b8e0fe141
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-001.html
>@@ -0,0 +1,86 @@
>+<!DOCTYPE html>
>+<html>
>+ <head>
>+  <title>CSS Test: CSSOM Media Query List Serialization</title>
>+  <link rel="author" title="Ben Sheldon" href="mailto:ben@codeforamerica.org">
>+  <link rel="author" title="Chapman Shoop" href="mailto:chapman.shoop@gmail.com">
>+  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-medialist-interface">
>+  <meta name="flags" content="dom">
>+  <meta name="assert" content="MediaLists are serialized according to the specification">
>+  <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+  <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+ </head>
>+ <body>
>+  <noscript>Test not run - javascript required.</noscript>
>+  <div id="log"></div>
>+  <script type="text/javascript">
>+
>+    var styleElement;
>+    var styleSheet;
>+    var mediaList;
>+
>+    // Setup
>+    function setup() {
>+      styleElement = document.getElementById("styleElement");
>+
>+      if (styleElement) {
>+        // teardown
>+        document.getElementsByTagName("head")[0].removeChild(styleElement);
>+        styleElement = undefined;
>+        styleSheet = undefined;
>+        mediaList = undefined;
>+      }
>+
>+      styleElement = document.createElement("style");
>+      styleElement.id = "styleElement";
>+      styleElement.type = "text/css";
>+      styleElement.media = "all";
>+      document.getElementsByTagName("head")[0].appendChild(styleElement);
>+      styleSheet = styleElement.sheet;
>+      mediaList = styleSheet.media;
>+    }
>+
>+
>+    test(function() {
>+        setup();
>+
>+        assert_equals(mediaList.mediaText, "all");
>+
>+    }, "mediatest_medialist_serialize_element",
>+    { help: ["http://www.w3.org/TR/cssom-1/#the-medialist-interface", "http://www.w3.org/TR/cssom-1/#serializing-media-queries"],
>+      assert: ["MediaList.mediaText equals the 'media' value of the initial 'style' element."] });
>+
>+    test(function() {
>+      setup();
>+
>+      mediaList.appendMedium('screen');
>+      assert_equals(mediaList.mediaText, "all, screen");
>+
>+    }, "mediatest_medialist_serialize_comma",
>+    { help: ["http://www.w3.org/TR/cssom-1/#the-medialist-interface", "http://www.w3.org/TR/cssom-1/#serialize-a-media-query-list"],
>+      assert: ["To serialize a comma-separated list concatenate all items of the list in list order while separating them by \",\" (U+002C), followed by a space (U+0020)."] });
>+
>+    test(function() {
>+      setup();
>+
>+      mediaList.deleteMedium('all');
>+      assert_equals(mediaList.mediaText, "");
>+
>+    }, "mediatest_medialist_serialize_empty",
>+    { help: ["http://www.w3.org/TR/cssom-1/#the-medialist-interface", "http://www.w3.org/TR/cssom-1/#serializing-media-queries"],
>+      assert: ["If the media query list is empty return the empty string."] });
>+
>+    test(function() {
>+      setup();
>+
>+      mediaList.appendMedium('screen');
>+      mediaList.appendMedium('print');
>+      assert_equals(mediaList.mediaText, "all, screen, print");
>+
>+    }, "mediatest_medialist_serialize_order",
>+    { help: ["http://www.w3.org/TR/cssom-1/#the-medialist-interface", "http://www.w3.org/TR/cssom-1/#serialize-a-media-query-list"],
>+      assert: ["Each media query should be sorted in the same order as they appear in the list of media queries."] });
>+
>+  </script>
>+ </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-002-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-002-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..2bf0654aff69fdee6bd5cba7b1e49b5b95e300ed
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-002-expected.txt
>@@ -0,0 +1,5 @@
>+
>+PASS deleteMedium_called_without_argument 
>+PASS deleteMedium_removes_correct_medium 
>+PASS deleteMedium_no_matching_medium_to_remove 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-002.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-002.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..0df587b95294e6ab4b9d5e68a6973b64d4df2b8d
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-002.html
>@@ -0,0 +1,71 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+  <title>CSS Test: CSSOM MediaList Interfaces</title>
>+  <link rel="author" title="Chapman Shoop" href="mailto:chapman.shoop@gmail.com">
>+  <link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> 
>+  <link rel="help" href="https://drafts.csswg.org/cssom/#the-medialist-interface">
>+  <meta name="flags" content="dom">
>+  <meta name="assert" content="MediaList object has deleteMedium method and it functions properly.">
>+  <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+  <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+</head>
>+
>+<body>
>+  <noscript>Test not run - javascript required.</noscript>
>+  <div id="log"></div>
>+
>+  <script type="text/javascript">
>+    function setup() {
>+      // Clean out any old style element
>+      var old_style_el = document.getElementById('test_style');
>+      if (old_style_el) {
>+        document.head.removeChild(old_style_el);
>+      }
>+
>+      // Create a fresh style element and return its media attribute
>+      var style_el = document.createElement('style');
>+      style_el.setAttribute('id', 'test_style');
>+      document.head.appendChild(style_el);
>+      return style_el.sheet.media;
>+    }
>+  </script>
>+
>+  <script type="text/javascript">
>+
>+    test(function() {
>+      media_list = setup();
>+      assert_throws(new TypeError, function() { media_list.deleteMedium(); });
>+    }, "deleteMedium_called_without_argument",
>+    { assert: "MediaList.deleteMedium called without argument throws error." });
>+
>+    test(function() {
>+      media_list = setup();
>+
>+      media_list.appendMedium("screen");
>+      media_list.appendMedium("all");
>+
>+      media_list.deleteMedium("screen");
>+
>+      assert_equals(media_list.length, 1);
>+      assert_equals(media_list.item(0), "all");
>+      assert_equals(media_list.mediaText, "all");
>+    }, "deleteMedium_removes_correct_medium",
>+    { assert: "MediaList.deleteMedium removes correct medium and updates corresponding properties." });
>+
>+    test(function() {
>+      media_list = setup();
>+
>+      media_list.appendMedium("all");
>+
>+      assert_throws("NotFoundError", () => media_list.deleteMedium("screen"));
>+
>+      assert_equals(media_list.length, 1);
>+      assert_equals(media_list.item(0), "all");
>+      assert_equals(media_list.mediaText, "all");
>+    }, "deleteMedium_no_matching_medium_to_remove",
>+    { assert: "MediaList.deleteMedium doesn't modify MediaList when medium is not found." });
>+
>+  </script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-003-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-003-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..50651628444e3cd07a3685a8d21260ed06055094
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-003-expected.txt
>@@ -0,0 +1,4 @@
>+
>+PASS mediatest_mediaquery_serialize_1 
>+PASS mediatest_mediaquery_serialize_2 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-003.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-003.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..72def18cabcca6550e9d4727bcc167d93a698a13
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-003.html
>@@ -0,0 +1,62 @@
>+<!DOCTYPE html>
>+<html>
>+ <head>
>+  <title>CSS Test: CSSOM Media Query Serialization</title>
>+  <link rel="author" title="Ben Sheldon" href="mailto:ben@codeforamerica.org">
>+  <link rel="author" title="Chapman Shoop" href="mailto:chapman.shoop@gmail.com">
>+  <link rel="help" href="http://www.w3.org/TR/cssom-1/#serializing-media-queries">
>+  <meta name="flags" content="dom">
>+  <meta name="assert" content="Media Queries are serialized according to the specification">
>+  <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+  <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+ </head>
>+ <body>
>+  <noscript>Test not run - javascript required.</noscript>
>+  <div id="log"></div>
>+  <script type="text/javascript">
>+
>+    var styleElement;
>+    var styleSheet;
>+    var mediaList;
>+
>+    // Setup - accepts media value for style element, e.g. <style media=???">
>+    function setupMedia(media) {
>+      styleElement = document.getElementById("styleElement");
>+
>+      if (styleElement) {
>+        // teardown
>+        document.getElementsByTagName("head")[0].removeChild(styleElement);
>+        styleElement = undefined;
>+        styleSheet = undefined;
>+        mediaList = undefined;
>+      }
>+
>+      styleElement = document.createElement("style");
>+      styleElement.id = "styleElement";
>+      styleElement.type = "text/css";
>+      styleElement.media = media;
>+      document.getElementsByTagName("head")[0].appendChild(styleElement);
>+      styleSheet = styleElement.sheet;
>+      mediaList = styleSheet.media;
>+    }
>+
>+
>+    test(function() {
>+        setupMedia('not screen and (min-WIDTH:5px) AND (max-width:40px )');
>+
>+        assert_equals(mediaList.mediaText, "not screen and (max-width: 40px) and (min-width: 5px)");
>+
>+    }, "mediatest_mediaquery_serialize_1",
>+    {  assert: ["First explicit example input (first column) and output (second column) in specification."] });
>+
>+    test(function() {
>+        setupMedia('all and (color) and (color)	');
>+
>+        assert_equals(mediaList.mediaText, "(color)");
>+
>+    }, "mediatest_mediaquery_serialize_2",
>+    { assert: ["Second explicit example input (first column) and output (second column) in specification."] });
>+
>+  </script>
>+ </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-004-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-004-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..38b18651a9ca8824758365d74d74c0c649a51de2
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-004-expected.txt
>@@ -0,0 +1,4 @@
>+
>+PASS appendMedium_correctly_appends_medium_to_empty_MediaList 
>+PASS appendMedium_correctly_appends_medium_to_nonempty_MediaList 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-004.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-004.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..8c7ba6921509384531773f9ce414b0e9a18f4e6c
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-004.html
>@@ -0,0 +1,64 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+  <title>CSS Test: CSSOM MediaList Interfaces</title>
>+  <link rel="author" title="Chapman Shoop" href="mailto:chapman.shoop@gmail.com">
>+  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-medialist-interface">
>+  <meta name="flags" content="dom">
>+  <meta name="assert" content="MediaList object has appendMedium method and it functions properly.">
>+  <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+  <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+</head>
>+
>+<body>
>+  <noscript>Test not run - javascript required.</noscript>
>+  <div id="log"></div>
>+
>+  <script type="text/javascript">
>+    function setup() {
>+      // Clean out any old style element
>+      var old_style_el = document.getElementById('test_style');
>+      if (old_style_el) {
>+        document.head.removeChild(old_style_el);
>+      }
>+
>+      // Create a fresh style element and return its media attribute
>+      var style_el = document.createElement('style');
>+      style_el.setAttribute('id', 'test_style');
>+      document.head.appendChild(style_el);
>+      return style_el.sheet.media;
>+    }
>+  </script>
>+
>+  <script type="text/javascript">
>+
>+    test(function() {
>+      media_list = setup();
>+
>+      media_list.appendMedium("all");
>+
>+      assert_equals(media_list.length, 1);
>+      assert_equals(media_list.item(0), "all");
>+      assert_equals(media_list.mediaText, "all");
>+    }, "appendMedium_correctly_appends_medium_to_empty_MediaList",
>+    { assert: "MediaList.appendMedium correctly adds medium to empty MediaList." });
>+
>+    test(function() {
>+      media_list = setup();
>+
>+      media_list.appendMedium("screen");
>+      media_list.appendMedium("all");
>+
>+      // The ordering of array items should be different from that of the mediaText element.
>+      // "all" should be appended after "screen" in the array, but "mediaText" should be
>+      // "all, screen" due to lexicographical sorting.
>+      assert_equals(media_list.length, 2);
>+      assert_equals(media_list.item(0), "screen");
>+      assert_equals(media_list.item(1), "all");
>+      assert_equals(media_list.mediaText, "screen, all");
>+    }, "appendMedium_correctly_appends_medium_to_nonempty_MediaList",
>+    { assert: "MediaList.appendMedium correctly adds medium to a MediaList that already has a medium." });
>+
>+  </script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/overflow-serialization-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/overflow-serialization-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..a04f2d1860e375dd511cff796289691b119c4025
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/overflow-serialization-expected.txt
>@@ -0,0 +1,3 @@
>+
>+FAIL CSSOM - Overflow shorthand serialization assert_equals: Overflow-x/y longhands with same CSS-wide keyword should serialize correctly. expected "overflow: initial;" but got ""
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/overflow-serialization.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/overflow-serialization.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..7b01568a715782bc900701d004d4ce935641a8f4
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/overflow-serialization.html
>@@ -0,0 +1,49 @@
>+<!doctype html>
>+<html>
>+<head>
>+    <meta charset="utf-8">
>+    <title>CSSOM - Overflow shorthand serialization</title>
>+    <link rel="help" href="https://drafts.csswg.org/cssom/#serialize-a-css-value">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+    <style>
>+        div { overflow: inherit; }
>+        div { overflow: hidden; }
>+        div { overflow-x: initial; overflow-y: initial; }
>+        div { overflow-x: scroll; overflow-y: scroll; }
>+        div { overflow-x: scroll; overflow-y: hidden; }
>+    </style>
>+
>+    <script>
>+    test(function () {
>+        var styleSheet = document.styleSheets[0];
>+
>+        assert_equals(styleSheet.cssRules[0].style.cssText, "overflow: inherit;", "Single value overflow with CSS-wide keyword should serialize correctly.");
>+        assert_equals(styleSheet.cssRules[1].style.cssText, "overflow: hidden;", "Single value overflow with non-CSS-wide keyword should serialize correctly.");
>+        assert_equals(styleSheet.cssRules[2].style.cssText, "overflow: initial;", "Overflow-x/y longhands with same CSS-wide keyword should serialize correctly.");
>+        assert_equals(styleSheet.cssRules[3].style.cssText, "overflow: scroll;", "Overflow-x/y longhands with same non-CSS-wide keyword should serialize correctly.");
>+        assert_equals(styleSheet.cssRules[4].style.cssText, "overflow: scroll hidden;", "Overflow-x/y longhands with different keywords should serialize correctly.");
>+
>+        var div = document.createElement('div');
>+        div.style.overflow = "inherit";
>+        assert_equals(div.style.overflow, "inherit", "Single value overflow with CSS-wide keyword should serialize correctly.");
>+
>+        div.style.overflow = "hidden";
>+        assert_equals(div.style.overflow, "hidden", "Single value overflow with non-CSS-wide keyword should serialize correctly.");
>+
>+        div.style.overflow = "";
>+        div.style.overflowX = "initial";
>+        div.style.overflowY = "initial";
>+        assert_equals(div.style.overflow, "initial", "Overflow-x/y longhands with same CSS-wide keyword should serialize correctly.");
>+
>+        div.style.overflowX = "scroll";
>+        div.style.overflowY = "scroll";
>+        assert_equals(div.style.overflow, "scroll", "Overflow-x/y longhands with same non-CSS-wide keyword should serialize correctly.");
>+
>+        div.style.overflowX = "scroll";
>+        div.style.overflowY = "hidden";
>+        assert_equals(div.style.overflow, "scroll hidden", "Overflow-x/y longhands with different keywords should serialize correctly.");
>+    });
>+    </script>
>+</head>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-order-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-order-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..b11dbe33ddbe38af4f711b16e3c3133014956e77
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-order-expected.txt
>@@ -0,0 +1,4 @@
>+This text should be green
>+
>+PASS Preferred stylesheet where insertion order is reversed tree order 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-order.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-order.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..3231a7e711569357a1cc76a84200da8a3b69c3b3
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-order.html
>@@ -0,0 +1,22 @@
>+<!DOCTYPE html>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#add-a-css-style-sheet">
>+<link rel="help" href="https://drafts.csswg.org/cssom/#create-a-css-style-sheet">
>+<link rel="help" href="https://html.spec.whatwg.org/#update-a-style-block">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<div id="t1">This text should be green</div>
>+<script>
>+function createStyleElement(text, title) {
>+    var elm = document.createElement("style");
>+    elm.setAttribute("title", title);
>+    elm.appendChild(document.createTextNode(text));
>+    return elm;
>+}
>+
>+test(function() {
>+    document.head.appendChild(createStyleElement("#t1 {color:green}", "preferred"));
>+    document.head.appendChild(createStyleElement("#t1 {color:red}", "notpreferred"));
>+
>+    assert_equals(getComputedStyle(t1).color, "rgb(0, 128, 0)");
>+}, "Preferred stylesheet where insertion order is reversed tree order");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-reversed-order-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-reversed-order-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..db0305bc9300db56e98fc4ccb1140e8108a88a7d
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-reversed-order-expected.txt
>@@ -0,0 +1,4 @@
>+This text should be green
>+
>+FAIL Preferred stylesheet where insertion order is tree order assert_equals: expected "rgb(0, 128, 0)" but got "rgb(255, 0, 0)"
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-reversed-order.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-reversed-order.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..839ecafb6faf170da4a2987f9b7d8137b024cc00
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-reversed-order.html
>@@ -0,0 +1,22 @@
>+<!DOCTYPE html>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#add-a-css-style-sheet">
>+<link rel="help" href="https://drafts.csswg.org/cssom/#create-a-css-style-sheet">
>+<link rel="help" href="https://html.spec.whatwg.org/#update-a-style-block">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<div id="t1">This text should be green</div>
>+<script>
>+function createStyleElement(text, title) {
>+    var elm = document.createElement("style");
>+    elm.setAttribute("title", title);
>+    elm.appendChild(document.createTextNode(text));
>+    return elm;
>+}
>+
>+test(function() {
>+    document.head.insertBefore(createStyleElement("#t1 {color:green}", "preferred"), document.head.firstChild);
>+    document.head.insertBefore(createStyleElement("#t1 {color:red}", "notpreferred"), document.head.firstChild);
>+
>+    assert_equals(getComputedStyle(t1).color, "rgb(0, 128, 0)");
>+}, "Preferred stylesheet where insertion order is tree order");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorSerialize-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorSerialize-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..25a44863418841774397d61a4acb27a764b4c686
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorSerialize-expected.txt
>@@ -0,0 +1,20 @@
>+
>+FAIL :nth-child serialization produces canonical form assert_equals: expected ":nth-child(3n)" but got ":nth-child(3n - 0)"
>+PASS single universal selector shows '*' when serialized. 
>+PASS single type (simple) selector in the sequence of simple selectors that is not a universal selector 
>+PASS single class (simple) selector in the sequence of simple selectors that is not a universal selector 
>+PASS single id (simple) selector in the sequence of simple selectors that is not a universal selector 
>+PASS single pseudo (simple) selector which does not accept arguments in the sequence of simple selectors that is not a universal selector 
>+FAIL single pseudo (simple) selector "lang" which accepts arguments in the sequence of simple selectors that is not a universal selector assert_equals: expected ":lang(ja)" but got ":lang(\"ja\")"
>+FAIL single pseudo (simple) selector "nth-child" which accepts arguments in the sequence of simple selectors that is not a universal selector assert_equals: expected ":nth-child(2n)" but got ":nth-child(even)"
>+FAIL single pseudo (simple) selector "nth-last-child" which accepts arguments in the sequence of simple selectors that is not a universal selector assert_equals: expected ":nth-last-child(2n)" but got ":nth-last-child(even)"
>+FAIL single pseudo (simple) selector "nth-of-child" which accepts arguments in the sequence of simple selectors that is not a universal selector assert_equals: expected ":nth-of-type(2n)" but got ":nth-of-type(even)"
>+FAIL single pseudo (simple) selector ":nth-last-of-type" which accepts arguments in the sequence of simple selectors that is not a universal selector assert_equals: expected ":nth-last-of-type(2n)" but got ":nth-last-of-type(even)"
>+PASS single pseudo (simple) selector ":not" which accepts arguments in the sequence of simple selectors that is not a universal selector 
>+FAIL escaped character in attribute name assert_equals: expected "[ns\\:foo]" but got "[ns:foo]"
>+FAIL escaped character as code point in attribute name assert_equals: expected "[\\30 zonk]" but got "[0zonk]"
>+FAIL escaped character (@) in attribute name assert_equals: expected "[\\@]" but got "[@]"
>+FAIL escaped character in attribute name with any namespace assert_equals: expected "[*|ns\\:foo]" but got "[*|ns:foo]"
>+FAIL escaped character in attribute prefix assert_equals: expected "[ns\\:odd|foo]" but got "[ns:odd|foo]"
>+FAIL escaped character in both attribute prefix and name assert_equals: expected "[ns\\:odd|odd\:name]" but got "[ns:odd|odd:name]"
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorSerialize.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorSerialize.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..d171a9da94e22af018ffb5f182f99362b5c0e4cb
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorSerialize.html
>@@ -0,0 +1,120 @@
>+<!DOCTYPE html>
>+<html>
>+    <head>
>+        <title>CSSOM Test: test serialized selector which is only one simple selector in the sequence of simple selectors</title>
>+        <link rel="author" title="T.Nishitani" href="mailto:lequinharay@gmail.com">
>+        <link rel="reviewer" title="L. David Baron" href="https://dbaron.org/">
>+        <link rel="help" href="https://drafts.csswg.org/cssom-1/#serializing-selectors">
>+        <meta name="flags" content="dom">
>+        <meta charset="utf-8">
>+        <script src="../../../../../resources/testharness.js"></script>
>+        <script src="../../../../../resources/testharnessreport.js"></script>
>+        <style id="teststyles">
>+        </style>
>+    </head>
>+    <body>
>+        <div id="log"></div>
>+        <script>
>+            function assert_selector_serializes_to(source, expected_result) {
>+              var style_element = document.getElementById("teststyles");
>+              style_element.firstChild.data = source + "{ font-size: 1em; }";
>+              var sheet = style_element.sheet;
>+              assert_equals(sheet.cssRules[sheet.cssRules.length - 1].selectorText, expected_result);
>+            }
>+
>+            function run_tests_on_anplusb_selector(source) {
>+                assert_selector_serializes_to(source + '( even   )', source + '(2n)');
>+                assert_selector_serializes_to(source + '(   odd )', source + '(2n+1)');
>+                assert_selector_serializes_to(source + '( +10  )', source + '(10)');
>+                assert_selector_serializes_to(source + '(   -10 )', source + '(-10)');
>+                assert_selector_serializes_to(source + '( +4n  )', source + '(4n)');
>+                assert_selector_serializes_to(source + '( -3n   )', source + '(-3n)');
>+                assert_selector_serializes_to(source + '( 1n + 5  )', source + '(n+5)');
>+                assert_selector_serializes_to(source + '( -1n +     5 )', source + '(-n+5)');
>+                assert_selector_serializes_to(source + '( -1n     - 5 )', source + '(-n-5)');
>+            }
>+
>+            test(function() {
>+              assert_selector_serializes_to(":nth-child(  3n - 0)", ":nth-child(3n)");
>+              assert_selector_serializes_to(":nth-child(  1n - 0)", ":nth-child(n)");
>+            }, ":nth-child serialization produces canonical form");
>+
>+
>+            /* for universal selecter with default namespace */
>+            test(function(){
>+                /* this is single universal selector */
>+                assert_selector_serializes_to('*', '*');
>+                assert_selector_serializes_to(' * ', '*');
>+            }, 'single universal selector shows \'*\' when serialized.')
>+
>+            test(function(){
>+                assert_selector_serializes_to('div', 'div');
>+                assert_selector_serializes_to(' div ', 'div');
>+            }, 'single type (simple) selector in the sequence of simple selectors that is not a universal selector')
>+
>+            test(function(){
>+                assert_selector_serializes_to('.class', '.class');
>+                assert_selector_serializes_to(' .class    ', '.class');
>+            }, 'single class (simple) selector in the sequence of simple selectors that is not a universal selector')
>+
>+            test(function(){
>+                assert_selector_serializes_to('#id', '#id');
>+                assert_selector_serializes_to('     #id ', '#id');
>+            }, 'single id (simple) selector in the sequence of simple selectors that is not a universal selector')
>+
>+            test(function(){
>+                assert_selector_serializes_to(':hover', ':hover');
>+                assert_selector_serializes_to('    :hover    ', ':hover');
>+            }, 'single pseudo (simple) selector which does not accept arguments in the sequence of simple selectors that is not a universal selector')
>+
>+            test(function(){
>+                assert_selector_serializes_to(':lang(ja)', ':lang(ja)');
>+                assert_selector_serializes_to(':lang( ja )', ':lang(ja)');
>+            }, 'single pseudo (simple) selector "lang" which accepts arguments in the sequence of simple selectors that is not a universal selector')
>+
>+
>+            test(function(){
>+                run_tests_on_anplusb_selector(':nth-child');
>+            }, 'single pseudo (simple) selector "nth-child" which accepts arguments in the sequence of simple selectors that is not a universal selector')
>+
>+            test(function(){
>+                run_tests_on_anplusb_selector(':nth-last-child');
>+            }, 'single pseudo (simple) selector "nth-last-child" which accepts arguments in the sequence of simple selectors that is not a universal selector')
>+
>+            test(function(){
>+                run_tests_on_anplusb_selector(':nth-of-type');
>+            }, 'single pseudo (simple) selector "nth-of-child" which accepts arguments in the sequence of simple selectors that is not a universal selector')
>+
>+            test(function(){
>+                run_tests_on_anplusb_selector(':nth-last-of-type');
>+            }, 'single pseudo (simple) selector ":nth-last-of-type" which accepts arguments in the sequence of simple selectors that is not a universal selector')
>+
>+            test(function(){
>+                assert_selector_serializes_to(' :not( abc ) ', ':not(abc)');
>+                assert_selector_serializes_to(' :not(  .head ) ', ':not(.head)');
>+                assert_selector_serializes_to(' :not(  #head   ) ', ':not(#head)');
>+                assert_selector_serializes_to(' :not(  :hover   ) ', ':not(:hover)');
>+            }, 'single pseudo (simple) selector ":not" which accepts arguments in the sequence of simple selectors that is not a universal selector')
>+
>+            var escaped_ns_rule = "@namespace ns\\:odd url(ns);";
>+            test(function() {
>+                assert_selector_serializes_to("[ns\\:foo]", "[ns\\:foo]");
>+            }, "escaped character in attribute name");
>+            test(function() {
>+                assert_selector_serializes_to("[\\30zonk]", "[\\30 zonk]");
>+            }, "escaped character as code point in attribute name");
>+            test(function() {
>+                assert_selector_serializes_to("[\\@]", "[\\@]");
>+            }, "escaped character (@) in attribute name");
>+            test(function() {
>+                assert_selector_serializes_to("[*|ns\\:foo]", "[*|ns\\:foo]");
>+            }, "escaped character in attribute name with any namespace");
>+            test(function() {
>+                assert_selector_serializes_to(escaped_ns_rule + "[ns\\:odd|foo]", "[ns\\:odd|foo]");
>+            }, "escaped character in attribute prefix");
>+            test(function() {
>+                assert_selector_serializes_to(escaped_ns_rule + "[ns\\:odd|odd\\:name]", "[ns\\:odd|odd\\:name]");
>+            }, "escaped character in both attribute prefix and name");
>+        </script>
>+    </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-001-expected.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-001-expected.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..74e580747083b3e9ff8d48876c08b83ddaa8d5cb
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-001-expected.html
>@@ -0,0 +1,13 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>(Ref #1) CSSOM - CSSStyleRule.selectorText Modification Restyle - Reference #1</title>
>+
>+<style>
>+div {
>+  color: green;
>+}
>+</style>
>+
>+<body>
>+<div>I should be green.</div>
>+</body>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-001.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-001.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..43a76d1ef2e99f1874793da7e74f27dd6e32e134
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-001.html
>@@ -0,0 +1,22 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>(Test #1) CSSOM - CSSStyleRule.selectorText Modification Restyle - Test #1</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#dom-cssstylerule-selectortext">
>+<link rel="match" href="selectorText-modification-restyle-001-ref.html">
>+
>+<style>
>+@namespace bogus url(http://example.com/bogus);
>+
>+bogus|div {
>+  color: green;
>+}
>+</style>
>+
>+<body>
>+<div>I should be green.</div>
>+<script>
>+// Remove the "bogus" namespace--now it should apply to the div above.
>+// We also expect to see a restyle.
>+document.querySelector("style").sheet.cssRules[1].selectorText = "div";
>+</script>
>+</body>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-002-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-002-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..a3c7a3e1aa2206fbf33a89eadbf83e2a56e18848
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-002-expected.txt
>@@ -0,0 +1,4 @@
>+
>+PASS Check initial color. 
>+FAIL Check that color changes correctly after shadow stylesheet selector and #container class is changed. undefined is not an object (evaluating 'root.styleSheets[0]')
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-002.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-002.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..8ad4825b7f9a7a65f8140f99fd0a7231627c5d85
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-002.html
>@@ -0,0 +1,31 @@
>+<!DOCTYPE html>
>+<title>CSSOM: Modify selectorText in a shadow tree stylesheet</title>
>+<link rel="author" title="Rune Lillesveen" href="mailto:futhark@chromium.org">
>+<link rel="help" href="https://drafts.csswg.org/cssom/#dom-cssstylerule-selectortext">
>+<link rel="help" href="https://drafts.csswg.org/css-scoping/#selectors">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<style>
>+  #container { color: red }
>+  .subtree * { color: pink }
>+</style>
>+<div id="container">
>+  <div id="host"></div>
>+</div>
>+<script>
>+  const root = host.attachShadow({mode:"open"});
>+  root.innerHTML = "<style>nomatch { color: green }</style><div>Green</div>";
>+  const div = root.querySelector("div");
>+
>+  test(() => {
>+    assert_equals(getComputedStyle(div).color, "rgb(255, 0, 0)", "Color should initial be red.");
>+  }, "Check initial color.");
>+
>+  test(() => {
>+    // The combination of the .subtree and CSSOM selector style invalidations
>+    // caused the Blink implementation to fail an assertion.
>+    container.className = "subtree";
>+    root.styleSheets[0].cssRules[0].selectorText = "div";
>+    assert_equals(getComputedStyle(div).color, "rgb(0, 128, 0)", "Color should be green after stylesheet change.");
>+  }, "Check that color changes correctly after shadow stylesheet selector and #container class is changed.");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialization-CSSDeclaration-with-important-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialization-CSSDeclaration-with-important-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..3a82c9e37815254223cce8799797db64734d76b1
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialization-CSSDeclaration-with-important-expected.txt
>@@ -0,0 +1,6 @@
>+
>+PASS Inline style declaration without whitespace between '!' and 'important'. 
>+PASS Inline style declaration with whitespace between '!' and 'important'. 
>+PASS Style set dynamically via cssText without whitespace between '!' and 'important'. 
>+PASS Style set dynamically via cssText with whitespace between '!' and 'important'. 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialization-CSSDeclaration-with-important.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialization-CSSDeclaration-with-important.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..642973bed569da7d3555e0de9284bca7f1ee4838
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialization-CSSDeclaration-with-important.html
>@@ -0,0 +1,32 @@
>+<!doctype html>
>+<meta charset=utf-8>
>+<title>cssom - Serialization of CSS declaration with "important" flag</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#serialize-a-css-declaration">
>+<script src=../../../../../resources/testharness.js></script>
>+<script src=../../../../../resources/testharnessreport.js></script>
>+<div id="noWhitespace" style="display: inline !important;"></div>
>+<div id="whitespace" style="background-color: blue !important; color: red ! important;"></div>
>+<div id="dinamicallyStyle"></div>
>+<script>
>+    test(function () {
>+        var css_style = document.querySelector('#noWhitespace').style.cssText;
>+        assert_equals(css_style, "display: inline !important;");
>+    }, "Inline style declaration without whitespace between '!' and 'important'.");
>+
>+    test(function () {
>+        var css_style = document.querySelector('#whitespace').style.cssText;
>+        assert_equals(css_style, "background-color: blue !important; color: red !important;");
>+    }, "Inline style declaration with whitespace between '!' and 'important'.");
>+
>+    test(function () {
>+        document.querySelector('#dinamicallyStyle').style.cssText = "color: black !important;";
>+        var css_style = document.querySelector('#dinamicallyStyle').style.cssText;
>+        assert_equals(css_style, "color: black !important;");
>+    }, "Style set dynamically via cssText without whitespace between '!' and 'important'.");
>+
>+    test(function () {
>+        document.querySelector('#dinamicallyStyle').style.cssText = "color: black ! important;";
>+        var css_style = document.querySelector('#dinamicallyStyle').style.cssText;
>+        assert_equals(css_style, "color: black !important;");
>+    }, "Style set dynamically via cssText with whitespace between '!' and 'important'.");
>+</script>
>\ No newline at end of file
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-namespaced-type-selectors-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-namespaced-type-selectors-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..30840a89404cdf762cc1501f0b083e951fb136eb
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-namespaced-type-selectors-expected.txt
>@@ -0,0 +1,62 @@
>+
>+PASS Simple type selector 
>+PASS Type selector without a namespace 
>+PASS Type selector with any namespace 
>+PASS Universal selector 
>+PASS Universal selector without a namespace 
>+PASS Universal selector in any namespace 
>+PASS Type selector with namespace 
>+PASS Universal selector with namespace 
>+PASS Simple type selector followed by class 
>+PASS Simple type selector followed by id 
>+PASS Simple type selector followed by pseudo class 
>+PASS Simple type selector followed by pseudo element 
>+PASS Simple type selector followed by atttribute selector 
>+PASS Type selector without a namespace followed by class 
>+PASS Type selector without a namespace followed by id 
>+PASS Type selector without a namespace followed by pseudo class 
>+PASS Type selector without a namespace followed by pseudo element 
>+PASS Type selector without a namespace followed by attribute selector 
>+PASS Type selector with any namespace followed by class 
>+PASS Type selector with any namespace followed by id 
>+PASS Type selector with any namespace followed by pseudo class 
>+PASS Type selector with any namespace followed by pseudo element 
>+PASS Type selector with any namespace followed by attribute selector 
>+PASS Universal selector followed by class 
>+PASS Universal selector followed by id 
>+PASS Universal selector followed by pseudo class 
>+PASS Universal selector followed by pseudo element 
>+PASS Universal selector followed by attribute selector 
>+PASS Universal selector without a namespace followed by class 
>+PASS Universal selector without a namespace followed by id 
>+PASS Universal selector without a namespace followed by pseudo class 
>+PASS Universal selector without a namespace followed by pseudo element 
>+PASS Universal selector without a namespace followed by attribute selector 
>+PASS Universal selector in any namespace followed by class 
>+PASS Universal selector in any namespace followed by id 
>+PASS Universal selector in any namespace followed by pseudo class 
>+PASS Universal selector in any namespace followed by pseudo element 
>+PASS Universal selector in any namespace followed by attribute selector 
>+PASS Type selector with namespace followed by class 
>+PASS Type selector with namespace followed by id 
>+PASS Type selector with namespace followed by pseudo class 
>+PASS Type selector with namespace followed by pseudo element 
>+PASS Type selector with namespace followed by attribute selector 
>+PASS Universal selector with namespace followed by class 
>+PASS Universal selector with namespace followed by id 
>+PASS Universal selector with namespace followed by pseudo class 
>+PASS Universal selector with namespace followed by pseudo element 
>+PASS Universal selector with namespace followed by attribute selector 
>+PASS Type selector with namespace equal to default namespace 
>+PASS Universal selector with namespace equal to default namespace 
>+PASS Type selector with namespace equal to default namespace followed by class 
>+PASS Type selector with namespace equal to default namespace followed by id 
>+PASS Type selector with namespace equal to default namespace followed by pseudo class 
>+PASS Type selector with namespace equal to default namespace followed by pseudo element 
>+PASS Type selector with namespace equal to default namespace followed by attribute selector 
>+PASS Universal selector with namespace equal to default namespace followed by class 
>+PASS Universal selector with namespace equal to default namespace followed by id 
>+PASS Universal selector with namespace equal to default namespace followed by pseudo class 
>+PASS Universal selector with namespace equal to default namespace followed by pseudo element 
>+PASS Universal selector with namespace equal to default namespace followed by attribute selector 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-namespaced-type-selectors.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-namespaced-type-selectors.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..65b667d49e0280f654ef41b55e5cecd1da2d77ee
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-namespaced-type-selectors.html
>@@ -0,0 +1,257 @@
>+<!DOCTYPE html>
>+<html>
>+    <head>
>+        <title>CSSOM Test: test serialization of type selectors and namespace prefixes</title>
>+        <link rel="author" title="Rune Lillesveen" href="mailto:rune@opera.com">
>+        <link rel="help" href="https://drafts.csswg.org/cssom-1/#serializing-selectors">
>+        <meta name="flags" content="dom">
>+        <meta charset="utf-8">
>+        <script src="../../../../../resources/testharness.js"></script>
>+        <script src="../../../../../resources/testharnessreport.js"></script>
>+        <style id="teststyles">
>+        </style>
>+    </head>
>+    <body>
>+        <div id="log"></div>
>+        <script>
>+            var ns_rule = "@namespace ns url(ns);";
>+            var default_ns_rules = "@namespace url(default_ns); @namespace nsdefault url(default_ns);" + ns_rule;
>+
>+            function assert_selector_serializes_to(source, expected_result) {
>+                var style_element = document.getElementById("teststyles");
>+                style_element.firstChild.data = source + "{ font-size: 1em; }";
>+                var sheet = style_element.sheet;
>+                assert_equals(sheet.cssRules[sheet.cssRules.length - 1].selectorText, expected_result);
>+            }
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "e", "e");
>+                assert_selector_serializes_to(default_ns_rules + "e", "e");
>+            }, "Simple type selector");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "|e", "|e");
>+                assert_selector_serializes_to(default_ns_rules + "|e", "|e");
>+            }, "Type selector without a namespace");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*|e", "e");
>+                assert_selector_serializes_to(default_ns_rules + "*|e", "*|e");
>+            }, "Type selector with any namespace");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*", "*");
>+                assert_selector_serializes_to(default_ns_rules + "*", "*");
>+            }, "Universal selector");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "|*", "|*");
>+                assert_selector_serializes_to(default_ns_rules + "|*", "|*");
>+            }, "Universal selector without a namespace");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*|*", "*");
>+                assert_selector_serializes_to(default_ns_rules + "*|*", "*|*");
>+            }, "Universal selector in any namespace");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "ns|e", "ns|e");
>+                assert_selector_serializes_to(default_ns_rules + "ns|e", "ns|e");
>+            }, "Type selector with namespace");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "ns|*", "ns|*");
>+                assert_selector_serializes_to(default_ns_rules + "ns|*", "ns|*");
>+            }, "Universal selector with namespace");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "e.c", "e.c");
>+                assert_selector_serializes_to(default_ns_rules + "e.c", "e.c");
>+            }, "Simple type selector followed by class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "e#i", "e#i");
>+                assert_selector_serializes_to(default_ns_rules + "e#i", "e#i");
>+            }, "Simple type selector followed by id");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "e:hover", "e:hover");
>+                assert_selector_serializes_to(default_ns_rules + "e:hover", "e:hover");
>+            }, "Simple type selector followed by pseudo class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "e::before", "e::before");
>+                assert_selector_serializes_to(default_ns_rules + "e::before", "e::before");
>+            }, "Simple type selector followed by pseudo element");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "e[attr]", "e[attr]");
>+                assert_selector_serializes_to(default_ns_rules + "e[attr]", "e[attr]");
>+            }, "Simple type selector followed by atttribute selector");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "|e.c", "|e.c");
>+                assert_selector_serializes_to(default_ns_rules + "|e.c", "|e.c");
>+            }, "Type selector without a namespace followed by class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "|e#i", "|e#i");
>+                assert_selector_serializes_to(default_ns_rules + "|e#i", "|e#i");
>+            }, "Type selector without a namespace followed by id");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "|e:hover", "|e:hover");
>+                assert_selector_serializes_to(default_ns_rules + "|e:hover", "|e:hover");
>+            }, "Type selector without a namespace followed by pseudo class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "|e::before", "|e::before");
>+                assert_selector_serializes_to(default_ns_rules + "|e::before", "|e::before");
>+            }, "Type selector without a namespace followed by pseudo element");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "|e[attr]", "|e[attr]");
>+                assert_selector_serializes_to(default_ns_rules + "|e[attr]", "|e[attr]");
>+            }, "Type selector without a namespace followed by attribute selector");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*|e.c", "e.c");
>+                assert_selector_serializes_to(default_ns_rules + "*|e.c", "*|e.c");
>+            }, "Type selector with any namespace followed by class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*|e#id", "e#id");
>+                assert_selector_serializes_to(default_ns_rules + "*|e#id", "*|e#id");
>+            }, "Type selector with any namespace followed by id");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*|e:hover", "e:hover");
>+                assert_selector_serializes_to(default_ns_rules + "*|e:hover", "*|e:hover");
>+            }, "Type selector with any namespace followed by pseudo class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*|e::before", "e::before");
>+                assert_selector_serializes_to(default_ns_rules + "*|e::before", "*|e::before");
>+            }, "Type selector with any namespace followed by pseudo element");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*|e[attr]", "e[attr]");
>+                assert_selector_serializes_to(default_ns_rules + "*|e[attr]", "*|e[attr]");
>+            }, "Type selector with any namespace followed by attribute selector");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*.c", ".c");
>+                assert_selector_serializes_to(default_ns_rules + "*.c", ".c");
>+            }, "Universal selector followed by class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*#i", "#i");
>+                assert_selector_serializes_to(default_ns_rules + "*#i", "#i");
>+            }, "Universal selector followed by id");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*:hover", ":hover");
>+                assert_selector_serializes_to(default_ns_rules + "*:hover", ":hover");
>+            }, "Universal selector followed by pseudo class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*::before", "::before");
>+                assert_selector_serializes_to(default_ns_rules + "*::before", "::before");
>+            }, "Universal selector followed by pseudo element");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*[attr]", "[attr]");
>+                assert_selector_serializes_to(default_ns_rules + "*[attr]", "[attr]");
>+            }, "Universal selector followed by attribute selector");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "|*.c", "|*.c");
>+                assert_selector_serializes_to(default_ns_rules + "|*.c", "|*.c");
>+            }, "Universal selector without a namespace followed by class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "|*#i", "|*#i");
>+                assert_selector_serializes_to(default_ns_rules + "|*#i", "|*#i");
>+            }, "Universal selector without a namespace followed by id");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "|*:hover", "|*:hover");
>+                assert_selector_serializes_to(default_ns_rules + "|*:hover", "|*:hover");
>+            }, "Universal selector without a namespace followed by pseudo class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "|*::before", "|*::before");
>+                assert_selector_serializes_to(default_ns_rules + "|*::before", "|*::before");
>+            }, "Universal selector without a namespace followed by pseudo element");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "|*[attr]", "|*[attr]");
>+                assert_selector_serializes_to(default_ns_rules + "|*[attr]", "|*[attr]");
>+            }, "Universal selector without a namespace followed by attribute selector");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*|*.c", ".c");
>+                assert_selector_serializes_to(default_ns_rules + "*|*.c", "*|*.c");
>+            }, "Universal selector in any namespace followed by class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*|*#id", "#id");
>+                assert_selector_serializes_to(default_ns_rules + "*|*#id", "*|*#id");
>+            }, "Universal selector in any namespace followed by id");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*|*:hover", ":hover");
>+                assert_selector_serializes_to(default_ns_rules + "*|*:hover", "*|*:hover");
>+            }, "Universal selector in any namespace followed by pseudo class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*|*::before", "::before");
>+                assert_selector_serializes_to(default_ns_rules + "*|*::before", "*|*::before");
>+            }, "Universal selector in any namespace followed by pseudo element");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "*|*[attr]", "[attr]");
>+                assert_selector_serializes_to(default_ns_rules + "*|*[attr]", "*|*[attr]");
>+            }, "Universal selector in any namespace followed by attribute selector");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "ns|e.c", "ns|e.c");
>+                assert_selector_serializes_to(default_ns_rules + "ns|e.c", "ns|e.c");
>+            }, "Type selector with namespace followed by class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "ns|e#i", "ns|e#i");
>+                assert_selector_serializes_to(default_ns_rules + "ns|e#i", "ns|e#i");
>+            }, "Type selector with namespace followed by id");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "ns|e:hover", "ns|e:hover");
>+                assert_selector_serializes_to(default_ns_rules + "ns|e:hover", "ns|e:hover");
>+            }, "Type selector with namespace followed by pseudo class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "ns|e::before", "ns|e::before");
>+                assert_selector_serializes_to(default_ns_rules + "ns|e::before", "ns|e::before");
>+            }, "Type selector with namespace followed by pseudo element");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "ns|e[attr]", "ns|e[attr]");
>+                assert_selector_serializes_to(default_ns_rules + "ns|e[attr]", "ns|e[attr]");
>+            }, "Type selector with namespace followed by attribute selector");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "ns|*.c", "ns|*.c");
>+                assert_selector_serializes_to(default_ns_rules + "ns|*.c", "ns|*.c");
>+            }, "Universal selector with namespace followed by class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "ns|*#i", "ns|*#i");
>+                assert_selector_serializes_to(default_ns_rules + "ns|*#i", "ns|*#i");
>+            }, "Universal selector with namespace followed by id");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "ns|*:hover", "ns|*:hover");
>+                assert_selector_serializes_to(default_ns_rules + "ns|*:hover", "ns|*:hover");
>+            }, "Universal selector with namespace followed by pseudo class");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "ns|*::before", "ns|*::before");
>+                assert_selector_serializes_to(default_ns_rules + "ns|*::before", "ns|*::before");
>+            }, "Universal selector with namespace followed by pseudo element");
>+            test(function() {
>+                assert_selector_serializes_to(ns_rule + "ns|*[attr]", "ns|*[attr]");
>+                assert_selector_serializes_to(default_ns_rules + "ns|*[attr]", "ns|*[attr]");
>+            }, "Universal selector with namespace followed by attribute selector");
>+            test(function() {
>+                assert_selector_serializes_to(default_ns_rules + "nsdefault|e", "e");
>+            }, "Type selector with namespace equal to default namespace");
>+            test(function() {
>+                assert_selector_serializes_to(default_ns_rules + "nsdefault|*", "*");
>+            }, "Universal selector with namespace equal to default namespace");
>+            test(function() {
>+                assert_selector_serializes_to(default_ns_rules + "nsdefault|e.c", "e.c");
>+            }, "Type selector with namespace equal to default namespace followed by class");
>+            test(function() {
>+                assert_selector_serializes_to(default_ns_rules + "nsdefault|e#i", "e#i");
>+            }, "Type selector with namespace equal to default namespace followed by id");
>+            test(function() {
>+                assert_selector_serializes_to(default_ns_rules + "nsdefault|e:hover", "e:hover");
>+            }, "Type selector with namespace equal to default namespace followed by pseudo class");
>+            test(function() {
>+                assert_selector_serializes_to(default_ns_rules + "nsdefault|e::before", "e::before");
>+            }, "Type selector with namespace equal to default namespace followed by pseudo element");
>+            test(function() {
>+                assert_selector_serializes_to(default_ns_rules + "nsdefault|e[attr]", "e[attr]");
>+            }, "Type selector with namespace equal to default namespace followed by attribute selector");
>+            test(function() {
>+                assert_selector_serializes_to(default_ns_rules + "nsdefault|*.c", ".c");
>+            }, "Universal selector with namespace equal to default namespace followed by class");
>+            test(function() {
>+                assert_selector_serializes_to(default_ns_rules + "nsdefault|*#i", "#i");
>+            }, "Universal selector with namespace equal to default namespace followed by id");
>+            test(function() {
>+                assert_selector_serializes_to(default_ns_rules + "nsdefault|*:hover", ":hover");
>+            }, "Universal selector with namespace equal to default namespace followed by pseudo class");
>+            test(function() {
>+                assert_selector_serializes_to(default_ns_rules + "nsdefault|*::before", "::before");
>+            }, "Universal selector with namespace equal to default namespace followed by pseudo element");
>+            test(function() {
>+                assert_selector_serializes_to(default_ns_rules + "nsdefault|*[attr]", "[attr]");
>+            }, "Universal selector with namespace equal to default namespace followed by attribute selector");
>+        </script>
>+    </body>
>+</html>
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-values-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-values-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..372047759b48e9ca414ef953b23cf0eae40caa6d
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-values-expected.txt
>@@ -0,0 +1,680 @@
>+
>+PASS background-attachment: scroll 
>+PASS background-attachment: fixed 
>+PASS background-attachment: inherit 
>+PASS background-color: black 
>+PASS background-color: red 
>+PASS background-color: rgb(50, 75, 100) 
>+FAIL background-color: rgba(5, 7, 10, 0.5) assert_equals: background-color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>+PASS background-color: transparent 
>+PASS background-color: inherit 
>+PASS background-image: url("http://localhost/") 
>+PASS background-image: url(http://localhost/) 
>+PASS background-image: none 
>+PASS background-image: inherit 
>+PASS background-position: 5% 5% 
>+PASS background-position: 5% .5% 
>+PASS background-position: 5% -5% 
>+PASS background-position: 5% -.5% 
>+PASS background-position: 5% 0px 
>+PASS background-position: 5% 1px 
>+PASS background-position: 5% .1em 
>+PASS background-position: 5% -0px 
>+PASS background-position: 5% -1px 
>+PASS background-position: 5% -.1em 
>+PASS background-position: 5% top 
>+PASS background-position: 5% center 
>+PASS background-position: 5% bottom 
>+PASS background-position: .5% 5% 
>+PASS background-position: .5% .5% 
>+PASS background-position: .5% -5% 
>+PASS background-position: .5% -.5% 
>+PASS background-position: .5% 0px 
>+PASS background-position: .5% 1px 
>+PASS background-position: .5% .1em 
>+PASS background-position: .5% -0px 
>+PASS background-position: .5% -1px 
>+PASS background-position: .5% -.1em 
>+PASS background-position: .5% top 
>+PASS background-position: .5% center 
>+PASS background-position: .5% bottom 
>+PASS background-position: -5% 5% 
>+PASS background-position: -5% .5% 
>+PASS background-position: -5% -5% 
>+PASS background-position: -5% -.5% 
>+PASS background-position: -5% 0px 
>+PASS background-position: -5% 1px 
>+PASS background-position: -5% .1em 
>+PASS background-position: -5% -0px 
>+PASS background-position: -5% -1px 
>+PASS background-position: -5% -.1em 
>+PASS background-position: -5% top 
>+PASS background-position: -5% center 
>+PASS background-position: -5% bottom 
>+PASS background-position: -.5% 5% 
>+PASS background-position: -.5% .5% 
>+PASS background-position: -.5% -5% 
>+PASS background-position: -.5% -.5% 
>+PASS background-position: -.5% 0px 
>+PASS background-position: -.5% 1px 
>+PASS background-position: -.5% .1em 
>+PASS background-position: -.5% -0px 
>+PASS background-position: -.5% -1px 
>+PASS background-position: -.5% -.1em 
>+PASS background-position: -.5% top 
>+PASS background-position: -.5% center 
>+PASS background-position: -.5% bottom 
>+PASS background-position: 0px 5% 
>+PASS background-position: 0px .5% 
>+PASS background-position: 0px -5% 
>+PASS background-position: 0px -.5% 
>+PASS background-position: 0px 0px 
>+PASS background-position: 0px 1px 
>+PASS background-position: 0px .1em 
>+PASS background-position: 0px -0px 
>+PASS background-position: 0px -1px 
>+PASS background-position: 0px -.1em 
>+PASS background-position: 0px top 
>+PASS background-position: 0px center 
>+PASS background-position: 0px bottom 
>+PASS background-position: 1px 5% 
>+PASS background-position: 1px .5% 
>+PASS background-position: 1px -5% 
>+PASS background-position: 1px -.5% 
>+PASS background-position: 1px 0px 
>+PASS background-position: 1px 1px 
>+PASS background-position: 1px .1em 
>+PASS background-position: 1px -0px 
>+PASS background-position: 1px -1px 
>+PASS background-position: 1px -.1em 
>+PASS background-position: 1px top 
>+PASS background-position: 1px center 
>+PASS background-position: 1px bottom 
>+PASS background-position: .1em 5% 
>+PASS background-position: .1em .5% 
>+PASS background-position: .1em -5% 
>+PASS background-position: .1em -.5% 
>+PASS background-position: .1em 0px 
>+PASS background-position: .1em 1px 
>+PASS background-position: .1em .1em 
>+PASS background-position: .1em -0px 
>+PASS background-position: .1em -1px 
>+PASS background-position: .1em -.1em 
>+PASS background-position: .1em top 
>+PASS background-position: .1em center 
>+PASS background-position: .1em bottom 
>+PASS background-position: -0px 5% 
>+PASS background-position: -0px .5% 
>+PASS background-position: -0px -5% 
>+PASS background-position: -0px -.5% 
>+PASS background-position: -0px 0px 
>+PASS background-position: -0px 1px 
>+PASS background-position: -0px .1em 
>+PASS background-position: -0px -0px 
>+PASS background-position: -0px -1px 
>+PASS background-position: -0px -.1em 
>+PASS background-position: -0px top 
>+PASS background-position: -0px center 
>+PASS background-position: -0px bottom 
>+PASS background-position: -1px 5% 
>+PASS background-position: -1px .5% 
>+PASS background-position: -1px -5% 
>+PASS background-position: -1px -.5% 
>+PASS background-position: -1px 0px 
>+PASS background-position: -1px 1px 
>+PASS background-position: -1px .1em 
>+PASS background-position: -1px -0px 
>+PASS background-position: -1px -1px 
>+PASS background-position: -1px -.1em 
>+PASS background-position: -1px top 
>+PASS background-position: -1px center 
>+PASS background-position: -1px bottom 
>+PASS background-position: -.1em 5% 
>+PASS background-position: -.1em .5% 
>+PASS background-position: -.1em -5% 
>+PASS background-position: -.1em -.5% 
>+PASS background-position: -.1em 0px 
>+PASS background-position: -.1em 1px 
>+PASS background-position: -.1em .1em 
>+PASS background-position: -.1em -0px 
>+PASS background-position: -.1em -1px 
>+PASS background-position: -.1em -.1em 
>+PASS background-position: -.1em top 
>+PASS background-position: -.1em center 
>+PASS background-position: -.1em bottom 
>+PASS background-position: left 5% 
>+PASS background-position: left .5% 
>+PASS background-position: left -5% 
>+PASS background-position: left -.5% 
>+PASS background-position: left 0px 
>+PASS background-position: left 1px 
>+PASS background-position: left .1em 
>+PASS background-position: left -0px 
>+PASS background-position: left -1px 
>+PASS background-position: left -.1em 
>+PASS background-position: left top 
>+PASS background-position: left center 
>+PASS background-position: left bottom 
>+PASS background-position: center 5% 
>+PASS background-position: center .5% 
>+PASS background-position: center -5% 
>+PASS background-position: center -.5% 
>+PASS background-position: center 0px 
>+PASS background-position: center 1px 
>+PASS background-position: center .1em 
>+PASS background-position: center -0px 
>+PASS background-position: center -1px 
>+PASS background-position: center -.1em 
>+PASS background-position: center top 
>+PASS background-position: center center 
>+PASS background-position: center bottom 
>+PASS background-position: right 5% 
>+PASS background-position: right .5% 
>+PASS background-position: right -5% 
>+PASS background-position: right -.5% 
>+PASS background-position: right 0px 
>+PASS background-position: right 1px 
>+PASS background-position: right .1em 
>+PASS background-position: right -0px 
>+PASS background-position: right -1px 
>+PASS background-position: right -.1em 
>+PASS background-position: right top 
>+PASS background-position: right center 
>+PASS background-position: right bottom 
>+PASS background-position: inherit 
>+PASS background-repeat: repeat 
>+PASS background-repeat: repeat-x 
>+PASS background-repeat: repeat-y 
>+PASS background-repeat: no-repeat 
>+PASS background-repeat: inherit 
>+PASS border-collapse: collapse 
>+PASS border-collapse: separate 
>+PASS border-collapse: inherit 
>+PASS border-spacing: 0px 
>+PASS border-spacing: 1px 
>+PASS border-spacing: .1em 
>+PASS border-spacing: inherit 
>+PASS border-top-color: black 
>+PASS border-top-color: red 
>+PASS border-top-color: rgb(50, 75, 100) 
>+FAIL border-top-color: rgba(5, 7, 10, 0.5) assert_equals: border-top-color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>+PASS border-top-color: transparent 
>+PASS border-top-color: inherit 
>+PASS border-right-color: black 
>+PASS border-right-color: red 
>+PASS border-right-color: rgb(50, 75, 100) 
>+FAIL border-right-color: rgba(5, 7, 10, 0.5) assert_equals: border-right-color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>+PASS border-right-color: transparent 
>+PASS border-right-color: inherit 
>+PASS border-bottom-color: black 
>+PASS border-bottom-color: red 
>+PASS border-bottom-color: rgb(50, 75, 100) 
>+FAIL border-bottom-color: rgba(5, 7, 10, 0.5) assert_equals: border-bottom-color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>+PASS border-bottom-color: transparent 
>+PASS border-bottom-color: inherit 
>+PASS border-left-color: black 
>+PASS border-left-color: red 
>+PASS border-left-color: rgb(50, 75, 100) 
>+FAIL border-left-color: rgba(5, 7, 10, 0.5) assert_equals: border-left-color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>+PASS border-left-color: transparent 
>+PASS border-left-color: inherit 
>+PASS border-top-style: none 
>+PASS border-top-style: hidden 
>+PASS border-top-style: dotted 
>+PASS border-top-style: dashed 
>+PASS border-top-style: solid 
>+PASS border-top-style: double 
>+PASS border-top-style: groove 
>+PASS border-top-style: ridge 
>+PASS border-top-style: inset 
>+PASS border-top-style: outset 
>+PASS border-top-style: inherit 
>+PASS border-right-style: none 
>+PASS border-right-style: hidden 
>+PASS border-right-style: dotted 
>+PASS border-right-style: dashed 
>+PASS border-right-style: solid 
>+PASS border-right-style: double 
>+PASS border-right-style: groove 
>+PASS border-right-style: ridge 
>+PASS border-right-style: inset 
>+PASS border-right-style: outset 
>+PASS border-right-style: inherit 
>+PASS border-bottom-style: none 
>+PASS border-bottom-style: hidden 
>+PASS border-bottom-style: dotted 
>+PASS border-bottom-style: dashed 
>+PASS border-bottom-style: solid 
>+PASS border-bottom-style: double 
>+PASS border-bottom-style: groove 
>+PASS border-bottom-style: ridge 
>+PASS border-bottom-style: inset 
>+PASS border-bottom-style: outset 
>+PASS border-bottom-style: inherit 
>+PASS border-left-style: none 
>+PASS border-left-style: hidden 
>+PASS border-left-style: dotted 
>+PASS border-left-style: dashed 
>+PASS border-left-style: solid 
>+PASS border-left-style: double 
>+PASS border-left-style: groove 
>+PASS border-left-style: ridge 
>+PASS border-left-style: inset 
>+PASS border-left-style: outset 
>+PASS border-left-style: inherit 
>+PASS border-top-width: thin 
>+PASS border-top-width: medium 
>+PASS border-top-width: thick 
>+PASS border-top-width: 0px 
>+PASS border-top-width: 1px 
>+PASS border-top-width: .1em 
>+PASS border-top-width: inherit 
>+PASS border-right-width: thin 
>+PASS border-right-width: medium 
>+PASS border-right-width: thick 
>+PASS border-right-width: 0px 
>+PASS border-right-width: 1px 
>+PASS border-right-width: .1em 
>+PASS border-right-width: inherit 
>+PASS border-bottom-width: thin 
>+PASS border-bottom-width: medium 
>+PASS border-bottom-width: thick 
>+PASS border-bottom-width: 0px 
>+PASS border-bottom-width: 1px 
>+PASS border-bottom-width: .1em 
>+PASS border-bottom-width: inherit 
>+PASS border-left-width: thin 
>+PASS border-left-width: medium 
>+PASS border-left-width: thick 
>+PASS border-left-width: 0px 
>+PASS border-left-width: 1px 
>+PASS border-left-width: .1em 
>+PASS border-left-width: inherit 
>+PASS bottom: 0px 
>+PASS bottom: 1px 
>+PASS bottom: .1em 
>+PASS bottom: 5% 
>+PASS bottom: .5% 
>+PASS bottom: auto 
>+PASS bottom: inherit 
>+PASS caption-side: top 
>+PASS caption-side: bottom 
>+PASS caption-side: inherit 
>+PASS clear: none 
>+PASS clear: left 
>+PASS clear: right 
>+PASS clear: both 
>+PASS clear: inherit 
>+PASS clip: rect(1em, auto, 0.5px, 2000em) 
>+PASS clip: auto 
>+PASS clip: inherit 
>+PASS color: black 
>+PASS color: red 
>+PASS color: rgb(50, 75, 100) 
>+FAIL color: rgba(5, 7, 10, 0.5) assert_equals: color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>+PASS color: inherit 
>+PASS content: normal 
>+PASS content: none 
>+FAIL content: "string" assert_equals: content raw inline style declaration expected "\"string\"" but got "string"
>+FAIL content: 'string' assert_equals: content raw inline style declaration expected "\"string\"" but got "string"
>+PASS content: url("http://localhost/") 
>+PASS content: url(http://localhost/) 
>+FAIL content: counter(par-num) assert_equals: content raw inline style declaration expected "counter(par-num)" but got "counter(par-num, decimal)"
>+FAIL content: counter(par-num, decimal) assert_equals: content raw inline style declaration expected "counter(par-num)" but got "counter(par-num, decimal)"
>+PASS content: counter(par-num, upper-roman) 
>+PASS content: attr(foo-bar) 
>+PASS content: attr(foo_bar) 
>+PASS content: inherit 
>+PASS cursor: auto 
>+PASS cursor: crosshair 
>+PASS cursor: default 
>+PASS cursor: pointer 
>+PASS cursor: move 
>+PASS cursor: e-resize 
>+PASS cursor: ne-resize 
>+PASS cursor: nw-resize 
>+PASS cursor: n-resize 
>+PASS cursor: se-resize 
>+PASS cursor: sw-resize 
>+PASS cursor: s-resize 
>+PASS cursor: w-resize 
>+PASS cursor: text 
>+PASS cursor: wait 
>+PASS cursor: help 
>+PASS cursor: progress 
>+PASS cursor: inherit 
>+PASS direction: ltr 
>+PASS direction: rtl 
>+PASS direction: inherit 
>+PASS display: inline 
>+PASS display: block 
>+PASS display: list-item 
>+PASS display: inline-block 
>+PASS display: table 
>+PASS display: inline-table 
>+PASS display: table-row-group 
>+PASS display: table-header-group 
>+PASS display: table-footer-group 
>+PASS display: table-row 
>+PASS display: table-column-group 
>+PASS display: table-column 
>+PASS display: table-cell 
>+PASS display: table-caption 
>+PASS display: none 
>+PASS display: inherit 
>+PASS empty-cells: show 
>+PASS empty-cells: hide 
>+PASS empty-cells: inherit 
>+PASS float: left 
>+PASS float: right 
>+PASS float: none 
>+PASS float: inherit 
>+PASS font-family: Arial 
>+PASS font-family: 'Lucida Grande' 
>+PASS font-family: serif 
>+PASS font-family: sans-serif 
>+PASS font-family: inherit 
>+PASS font-size: xx-small 
>+PASS font-size: x-small 
>+PASS font-size: small 
>+PASS font-size: medium 
>+PASS font-size: large 
>+PASS font-size: x-large 
>+PASS font-size: xx-large 
>+PASS font-size: larger 
>+PASS font-size: smaller 
>+PASS font-size: 0px 
>+PASS font-size: 1px 
>+PASS font-size: .1em 
>+PASS font-size: 5% 
>+PASS font-size: .5% 
>+PASS font-size: inherit 
>+PASS font-style: normal 
>+PASS font-style: italic 
>+PASS font-style: oblique 
>+PASS font-style: inherit 
>+FAIL font-variant: normal assert_equals: font-variant raw inline style declaration expected "normal" but got ""
>+FAIL font-variant: small-caps assert_equals: font-variant raw inline style declaration expected "small-caps" but got ""
>+FAIL font-variant: inherit assert_equals: font-variant raw inline style declaration expected "inherit" but got ""
>+PASS font-weight: normal 
>+PASS font-weight: bold 
>+PASS font-weight: bolder 
>+PASS font-weight: lighter 
>+PASS font-weight: 100 
>+PASS font-weight: 200 
>+PASS font-weight: 300 
>+PASS font-weight: 400 
>+PASS font-weight: 500 
>+PASS font-weight: 600 
>+PASS font-weight: 700 
>+PASS font-weight: 800 
>+PASS font-weight: 900 
>+PASS font-weight: inherit 
>+PASS height: 0px 
>+PASS height: 1px 
>+PASS height: .1em 
>+PASS height: 5% 
>+PASS height: .5% 
>+PASS height: auto 
>+PASS height: inherit 
>+PASS left: 0px 
>+PASS left: 1px 
>+PASS left: .1em 
>+PASS left: 5% 
>+PASS left: .5% 
>+PASS left: auto 
>+PASS left: inherit 
>+PASS letter-spacing: normal 
>+PASS letter-spacing: 0px 
>+PASS letter-spacing: 1px 
>+PASS letter-spacing: .1em 
>+PASS letter-spacing: inherit 
>+PASS line-height: normal 
>+PASS line-height: 0 
>+PASS line-height: -0 
>+PASS line-height: 1000 
>+PASS line-height: 0.9 
>+PASS line-height: 0px 
>+PASS line-height: 1px 
>+PASS line-height: .1em 
>+PASS line-height: 5% 
>+PASS line-height: .5% 
>+PASS line-height: inherit 
>+PASS list-style-image: url("http://localhost/") 
>+PASS list-style-image: url(http://localhost/) 
>+PASS list-style-image: none 
>+PASS list-style-image: inherit 
>+PASS list-style-position: inside 
>+PASS list-style-position: outside 
>+PASS list-style-position: inherit 
>+PASS list-style-type: disc 
>+PASS list-style-type: circle 
>+PASS list-style-type: square 
>+PASS list-style-type: decimal 
>+PASS list-style-type: decimal-leading-zero 
>+PASS list-style-type: lower-roman 
>+PASS list-style-type: upper-roman 
>+PASS list-style-type: lower-greek 
>+PASS list-style-type: lower-latin 
>+PASS list-style-type: upper-latin 
>+PASS list-style-type: armenian 
>+PASS list-style-type: georgian 
>+PASS list-style-type: lower-alpha 
>+PASS list-style-type: upper-alpha 
>+PASS list-style-type: none 
>+PASS list-style-type: inherit 
>+PASS margin-right: 0px 
>+PASS margin-right: 1px 
>+PASS margin-right: .1em 
>+PASS margin-right: 5% 
>+PASS margin-right: .5% 
>+PASS margin-right: auto 
>+PASS margin-right: inherit 
>+PASS margin-left: 0px 
>+PASS margin-left: 1px 
>+PASS margin-left: .1em 
>+PASS margin-left: 5% 
>+PASS margin-left: .5% 
>+PASS margin-left: auto 
>+PASS margin-left: inherit 
>+PASS margin-top: 0px 
>+PASS margin-top: 1px 
>+PASS margin-top: .1em 
>+PASS margin-top: 5% 
>+PASS margin-top: .5% 
>+PASS margin-top: auto 
>+PASS margin-top: inherit 
>+PASS margin-bottom: 0px 
>+PASS margin-bottom: 1px 
>+PASS margin-bottom: .1em 
>+PASS margin-bottom: 5% 
>+PASS margin-bottom: .5% 
>+PASS margin-bottom: auto 
>+PASS margin-bottom: inherit 
>+PASS max-height: 0px 
>+PASS max-height: 1px 
>+PASS max-height: .1em 
>+PASS max-height: 5% 
>+PASS max-height: .5% 
>+PASS max-height: none 
>+PASS max-height: inherit 
>+PASS max-width: 0px 
>+PASS max-width: 1px 
>+PASS max-width: .1em 
>+PASS max-width: 5% 
>+PASS max-width: .5% 
>+PASS max-width: none 
>+PASS max-width: inherit 
>+PASS min-height: 0px 
>+PASS min-height: 1px 
>+PASS min-height: .1em 
>+PASS min-height: 5% 
>+PASS min-height: .5% 
>+PASS min-height: inherit 
>+PASS min-width: 0px 
>+PASS min-width: 1px 
>+PASS min-width: .1em 
>+PASS min-width: 5% 
>+PASS min-width: .5% 
>+PASS min-width: inherit 
>+PASS orphans: 101 
>+PASS orphans: inherit 
>+PASS outline-color: black 
>+PASS outline-color: red 
>+PASS outline-color: rgb(50, 75, 100) 
>+FAIL outline-color: rgba(5, 7, 10, 0.5) assert_equals: outline-color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>+FAIL outline-color: invert assert_equals: outline-color raw inline style declaration expected "invert" but got ""
>+PASS outline-color: inherit 
>+PASS outline-style: none 
>+PASS outline-style: dotted 
>+PASS outline-style: dashed 
>+PASS outline-style: solid 
>+PASS outline-style: double 
>+PASS outline-style: groove 
>+PASS outline-style: ridge 
>+PASS outline-style: inset 
>+PASS outline-style: outset 
>+PASS outline-style: inherit 
>+PASS outline-width: thin 
>+PASS outline-width: medium 
>+PASS outline-width: thick 
>+PASS outline-width: 0px 
>+PASS outline-width: 1px 
>+PASS outline-width: .1em 
>+PASS outline-width: inherit 
>+PASS overflow: visible 
>+PASS overflow: hidden 
>+PASS overflow: scroll 
>+PASS overflow: auto 
>+PASS overflow: inherit 
>+PASS padding-top: 0px 
>+PASS padding-top: 1px 
>+PASS padding-top: .1em 
>+PASS padding-top: 5% 
>+PASS padding-top: .5% 
>+PASS padding-top: inherit 
>+PASS padding-right: 0px 
>+PASS padding-right: 1px 
>+PASS padding-right: .1em 
>+PASS padding-right: 5% 
>+PASS padding-right: .5% 
>+PASS padding-right: inherit 
>+PASS padding-bottom: 0px 
>+PASS padding-bottom: 1px 
>+PASS padding-bottom: .1em 
>+PASS padding-bottom: 5% 
>+PASS padding-bottom: .5% 
>+PASS padding-bottom: inherit 
>+PASS padding-left: 0px 
>+PASS padding-left: 1px 
>+PASS padding-left: .1em 
>+PASS padding-left: 5% 
>+PASS padding-left: .5% 
>+PASS padding-left: inherit 
>+FAIL page-break-after: auto assert_equals: page-break-after raw inline style declaration expected "auto" but got ""
>+FAIL page-break-after: always assert_equals: page-break-after raw inline style declaration expected "always" but got ""
>+FAIL page-break-after: avoid assert_equals: page-break-after raw inline style declaration expected "avoid" but got ""
>+FAIL page-break-after: left assert_equals: page-break-after raw inline style declaration expected "left" but got ""
>+FAIL page-break-after: right assert_equals: page-break-after raw inline style declaration expected "right" but got ""
>+PASS page-break-after: inherit 
>+FAIL page-break-before: auto assert_equals: page-break-before raw inline style declaration expected "auto" but got ""
>+FAIL page-break-before: always assert_equals: page-break-before raw inline style declaration expected "always" but got ""
>+FAIL page-break-before: avoid assert_equals: page-break-before raw inline style declaration expected "avoid" but got ""
>+FAIL page-break-before: left assert_equals: page-break-before raw inline style declaration expected "left" but got ""
>+FAIL page-break-before: right assert_equals: page-break-before raw inline style declaration expected "right" but got ""
>+PASS page-break-before: inherit 
>+FAIL page-break-inside: avoid assert_equals: page-break-inside raw inline style declaration expected "avoid" but got ""
>+FAIL page-break-inside: auto assert_equals: page-break-inside raw inline style declaration expected "auto" but got ""
>+PASS page-break-inside: inherit 
>+PASS position: static 
>+PASS position: relative 
>+PASS position: absolute 
>+PASS position: fixed 
>+PASS position: inherit 
>+PASS right: 0px 
>+PASS right: 1px 
>+PASS right: .1em 
>+PASS right: 5% 
>+PASS right: .5% 
>+PASS right: auto 
>+PASS right: inherit 
>+PASS table-layout: auto 
>+PASS table-layout: fixed 
>+PASS table-layout: inherit 
>+PASS text-align: left 
>+PASS text-align: right 
>+PASS text-align: center 
>+PASS text-align: justify 
>+PASS text-align: inherit 
>+PASS text-decoration: none 
>+PASS text-decoration: underline 
>+PASS text-decoration: overline 
>+PASS text-decoration: line-through 
>+PASS text-decoration: blink 
>+PASS text-decoration: inherit 
>+PASS text-indent: 0px 
>+PASS text-indent: 1px 
>+PASS text-indent: .1em 
>+PASS text-indent: 5% 
>+PASS text-indent: .5% 
>+PASS text-indent: inherit 
>+PASS text-transform: capitalize 
>+PASS text-transform: uppercase 
>+PASS text-transform: lowercase 
>+PASS text-transform: none 
>+PASS text-transform: inherit 
>+PASS top: 0px 
>+PASS top: 1px 
>+PASS top: .1em 
>+PASS top: 5% 
>+PASS top: .5% 
>+PASS top: auto 
>+PASS top: inherit 
>+PASS unicode-bidi: normal 
>+PASS unicode-bidi: embed 
>+PASS unicode-bidi: bidi-override 
>+PASS unicode-bidi: inherit 
>+PASS vertical-align: baseline 
>+PASS vertical-align: sub 
>+PASS vertical-align: super 
>+PASS vertical-align: top 
>+PASS vertical-align: text-top 
>+PASS vertical-align: middle 
>+PASS vertical-align: bottom 
>+PASS vertical-align: text-bottom 
>+PASS vertical-align: 5% 
>+PASS vertical-align: .5% 
>+PASS vertical-align: 0px 
>+PASS vertical-align: 1px 
>+PASS vertical-align: .1em 
>+PASS vertical-align: inherit 
>+PASS visibility: visible 
>+PASS visibility: hidden 
>+PASS visibility: collapse 
>+PASS visibility: inherit 
>+PASS white-space: normal 
>+PASS white-space: pre 
>+PASS white-space: nowrap 
>+PASS white-space: pre-wrap 
>+PASS white-space: pre-line 
>+PASS white-space: inherit 
>+PASS widows: 101 
>+PASS widows: inherit 
>+PASS width: 0px 
>+PASS width: 1px 
>+PASS width: .1em 
>+PASS width: 5% 
>+PASS width: .5% 
>+PASS width: auto 
>+PASS width: inherit 
>+PASS word-spacing: normal 
>+PASS word-spacing: 0px 
>+PASS word-spacing: 1px 
>+PASS word-spacing: .1em 
>+PASS word-spacing: inherit 
>+PASS z-index: auto 
>+PASS z-index: 0 
>+PASS z-index: 101 
>+PASS z-index: -51 
>+PASS z-index: inherit 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-values.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-values.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..1b02f754da88cfe3655ff70b7a26e5442c778127
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-values.html
>@@ -0,0 +1,597 @@
>+<!DOCTYPE html>
>+<meta charset="utf-8">
>+<title>CSSOM serialize values</title>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#serializing-css-values">
>+<meta name="author" title="Josh Matthews" href="mailto:josh@joshmatthews.net">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<body>
>+  <div id="log"></div>
>+  <div id="parent"></div>
>+  <script>
>+    function iterable(values) {
>+      var i = 0;
>+      return function() {
>+        if (i < values.length) {
>+          return values[i++];
>+        }
>+        return null;
>+      }
>+    }
>+
>+    function color() {
>+      var colors = ['black', 'red', 'rgb(50, 75, 100)', 'rgba(5, 7, 10, 0.5)'];
>+      return iterable(colors);
>+    }
>+
>+    function percentage() {
>+      var values = ["5%", {actual: ".5%", serialized: "0.5%"}];
>+      return iterable(values);
>+    }
>+
>+    function negative_percentage() {
>+      var values = ["-5%", {actual: "-.5%", serialized: "-0.5%"}];
>+      return iterable(values);
>+    }
>+
>+    function length() {
>+      var values = ["0px", "1px", {actual: ".1em", serialized: "0.1em"}];
>+      return iterable(values);
>+    }
>+
>+    function negative_length() {
>+      var values = [{actual: "-0px", serialized: "0px"},
>+                    "-1px", {actual: "-.1em", serialized: "-0.1em"}];
>+      return iterable(values);
>+    }
>+
>+    function degree() {
>+      var values = ["87deg"];
>+      return iterable(values);
>+    }
>+
>+    function uri() {
>+      var values = ["url(\"http://localhost/\")",
>+        {actual: "url(http://localhost/)",
>+         serialized: "url(\"http://localhost/\")"}];
>+      return iterable(values);
>+    }
>+
>+    function border_style() {
>+      var values = ['none', 'hidden', 'dotted', 'dashed', 'solid', 'double', 'groove', 'ridge',
>+                    'inset', 'outset'];
>+      return iterable(values);
>+    }
>+
>+    function border_style_without_hidden() {
>+      var values = ['none', 'dotted', 'dashed', 'solid', 'double', 'groove', 'ridge',
>+                    'inset', 'outset'];
>+      return iterable(values);
>+    }
>+
>+    function integer() {
>+      var values = ['0', '101', '-51'];
>+      return iterable(values);
>+    }
>+
>+    function nonzero_positive_integer() {
>+      var values = ['101'];
>+      return iterable(values);
>+    }
>+
>+    function shape() {
>+      var values = ['rect(1em, auto, 0.5px, 2000em)'];
>+      return iterable(values);
>+    }
>+
>+    function string() {
>+      var values = ['"string"', {actual: "'string'", serialized: '"string"'}];
>+      return iterable(values);
>+    }
>+
>+    function counter() {
>+      var values = ['counter(par-num)',
>+                    { actual: 'counter(par-num, decimal)', serialized: 'counter(par-num)' },
>+                    'counter(par-num, upper-roman)'];
>+      return iterable(values);
>+    }
>+
>+    function attr() {
>+      var values = ['attr(foo-bar)', 'attr(foo_bar)'];
>+      return iterable(values);
>+    }
>+
>+    function family_name() {
>+      var values = ['Arial', {actual: "'Lucida Grande'", serialized: '"Lucida Grande"'}];
>+      return iterable(values);
>+    }
>+
>+    function generic_family() {
>+      var values = ['serif', 'sans-serif'];
>+      return iterable(values);
>+    }
>+
>+    function absolute_size() {
>+      var values = ['xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large'];
>+      return iterable(values);
>+    }
>+
>+    function relative_size() {
>+      var values = ['larger', 'smaller'];
>+      return iterable(values);
>+    }
>+
>+    function number() {
>+      var values = ['0', {'actual': '-0', serialized: '0'}, '1000', '-5123', '0.9', '-0.09'];
>+      return iterable(values);
>+    }
>+
>+    function positive_number() {
>+      var values = ['0', {'actual': '-0', serialized: '0'}, '1000', '0.9'];
>+      return iterable(values);
>+    }
>+
>+    function generate_inline_style(name, value) {
>+      if (value) {
>+        return {'declaration': name + ": " + value.actual,
>+                'value': value.actual,
>+                'result': value.expected};
>+      }
>+      return null;
>+    }
>+
>+    function create_result(actual, expected) {
>+      return {actual: actual, expected: expected}
>+    }
>+
>+    function all_values(values) {
>+      var results = [];
>+      for (var i = 0; i < values.length; i++) {
>+        var value = values[i];
>+        if (typeof value == "function") {
>+          var f = value();
>+          var result;
>+          while ((result = f()) != null) {
>+            if (typeof result == "object" && 'serialized' in result) {
>+              results.push(create_result(result.actual, result.serialized));
>+            } else {
>+              results.push(create_result(result, result));
>+            }
>+          }
>+        } else if (typeof value == "string") {
>+          results.push(create_result(value, value));
>+        } else if (value instanceof Array) {
>+          var subresults = [];
>+          for (var j = 0; j < value.length; j++) {
>+            var subresult = all_values(value[j], true);
>+            if (!(subresult instanceof Array)) {
>+              subresult = [subresult];
>+            }
>+            subresults.push(subresult);
>+          }
>+          if (subresults.length > 1) {
>+            function choose_slices(vecs) {
>+              if (vecs.length == 1) {
>+                return vecs[0].map(function(v) { return [v]; });
>+              }
>+              var slice_results = [];
>+              var rest = choose_slices(vecs.slice(1, vecs.length));
>+              for (var a = 0; a < vecs[0].length; a++) {
>+                for (var b = 0; b < rest.length; b++) {
>+                  var result = vecs[0][a];
>+                  slice_results.push([result].concat(rest[b]));
>+                }
>+              }
>+              return slice_results;
>+            }
>+
>+            subresults = choose_slices(subresults).map(function (a) {
>+              var actual = a.map(function(a) { return a.actual });
>+              var expected = a.map(function(a) { return a.expected });
>+              return create_result(actual.join(' '), expected.join(' '))
>+            });
>+          }
>+          for (var j = 0; j < subresults.length; j++) {
>+            results = results.concat(subresults[j]);
>+          }
>+        } else if (value instanceof Object && 'serialized' in value) {
>+          results.push(create_result(value.actual, value.serialized));
>+        } else if (typeof value == "number") {
>+          results.push(create_result(value.toString(), value.toString()));
>+        } else {
>+          throw "unexpected value type: " + typeof(value);
>+        }
>+      }
>+      return results;
>+    }
>+
>+    function create_value_generator(property) {
>+      var results = all_values(property.values);
>+      return iterable(results);
>+    }
>+
>+    function to_idl(property) {
>+      return property.replace(/-\w/g, function(x){return x[1].toUpperCase()});
>+    }
>+
>+    function run_individual_test(property, generator, initial) {
>+      var elem = document.createElement('div');
>+      document.getElementById('parent').appendChild(elem);
>+      var test_data = generator();
>+      var style = generate_inline_style(property, test_data);
>+      if (!style) {
>+        return false;
>+      }
>+      var t = async_test(style.declaration);
>+
>+      t.add_cleanup(function() {
>+        document.getElementById('parent').removeChild(elem);
>+      });
>+
>+      t.step(function() {
>+        elem.setAttribute('style', style.declaration);
>+        var expected = style.result;
>+        var serialized = elem.style[to_idl(property)];
>+        assert_equals(serialized, expected, property + ' raw inline style declaration');
>+        elem.setAttribute('style', '');
>+        elem.style[to_idl(property)] = style.value;
>+        assert_equals(elem.style[to_idl(property)], expected, property + ' style property');
>+      });
>+      t.done();
>+      return true;
>+    }
>+
>+    function test_property(property) {
>+      var generator = create_value_generator(property[1]);
>+      while (run_individual_test(property[0], generator, property[1].initial)) {
>+      }
>+    }
>+
>+    var properties = [
>+      ['background-attachment', {
>+        'values': ['scroll', 'fixed', 'inherit'],
>+        'initial': 'scroll',
>+      }],
>+      ['background-color', {
>+        'values': [color, 'transparent', 'inherit'],
>+        'initial': 'transparent',
>+      }],
>+      ['background-image', {
>+        'values': [uri, 'none', 'inherit'],
>+        'initial': 'none',
>+      }],
>+      ['background-position', {
>+        'values': [[[percentage, negative_percentage, length, negative_length,
>+                     'left', 'center', 'right'],
>+                    [percentage, negative_percentage, length, negative_length,
>+                     'top', 'center', 'bottom']],
>+                   'inherit'],
>+        'initial': '0% 0%',
>+      }],
>+      ['background-repeat', {
>+        'values': ['repeat', 'repeat-x', 'repeat-y', 'no-repeat', 'inherit'],
>+        'initial': 'repeat',
>+      }],
>+      //background
>+      ['border-collapse', {
>+        'values': ['collapse', 'separate', 'inherit'],
>+        'initial': 'separate',
>+      }],
>+      //border-color
>+      ['border-spacing', {
>+        'values': [length, 'inherit'],
>+        'initial': '0',
>+      }],
>+      //border-style
>+      //border-top, border-right, border-bottom, border-left
>+      ['border-top-color', {
>+        'values': [color, 'transparent', 'inherit'],
>+        'initial': 'black', //FIXME
>+      }],
>+      ['border-right-color', {
>+        'values': [color, 'transparent', 'inherit'],
>+        'initial': 'black', //FIXME
>+      }],
>+      ['border-bottom-color', {
>+        'values': [color, 'transparent', 'inherit'],
>+        'initial': 'black', //FIXME
>+      }],
>+      ['border-left-color', {
>+        'values': [color, 'transparent', 'inherit'],
>+        'initial': 'black', //FIXME
>+      }],
>+      ['border-top-style', {
>+        'values': [border_style, 'inherit'],
>+        'initial': null,
>+      }],
>+      ['border-right-style', {
>+        'values': [border_style, 'inherit'],
>+        'initial': null,
>+      }],
>+      ['border-bottom-style', {
>+        'values': [border_style, 'inherit'],
>+        'initial': null,
>+      }],
>+      ['border-left-style', {
>+        'values': [border_style, 'inherit'],
>+        'initial': null,
>+      }],
>+      ['border-top-width', {
>+        'values': ['thin', 'medium', 'thick', length, 'inherit'],
>+        'initial': 'medium',
>+      }],
>+      ['border-right-width', {
>+        'values': ['thin', 'medium', 'thick', length, 'inherit'],
>+        'initial': 'medium',
>+      }],
>+      ['border-bottom-width', {
>+        'values': ['thin', 'medium', 'thick', length, 'inherit'],
>+        'initial': 'medium',
>+      }],
>+      ['border-left-width', {
>+        'values': ['thin', 'medium', 'thick', length, 'inherit'],
>+        'initial': 'medium',
>+      }],
>+      //border-width
>+      //border
>+      ['bottom', {
>+        'values': [length, percentage, 'auto', 'inherit'],
>+        'initial': 'auto',
>+      }],
>+      ['caption-side', {
>+        'values': ['top', 'bottom', 'inherit'],
>+        'initial': 'top',
>+      }],
>+      ['clear', {
>+        'values': ['none', 'left', 'right', 'both', 'inherit'],
>+        'initial': 'none',
>+      }],
>+      ['clip', {
>+        'values': [shape, 'auto', 'inherit'],
>+        'initial': 'auto',
>+      }],
>+      ['color', {
>+        'values': [color, 'inherit'],
>+        'initial': 'black', //FIXME depends on user agent
>+      }],
>+      ['content', {
>+        'values': ['normal', 'none', string, uri, counter, attr, 'inherit'], //FIXME
>+        'initial': 'normal',
>+      }],
>+      //counter-increment
>+      //counter-reset
>+      ['cursor', {
>+        'values': [ 'auto', 'crosshair', 'default', 'pointer', 'move', 'e-resize', 'ne-resize',
>+                    'nw-resize', 'n-resize', 'se-resize', 'sw-resize', 's-resize', 'w-resize',
>+                    'text', 'wait', 'help', 'progress', 'inherit'],
>+        'initial': 'auto',
>+      }],
>+      ['direction', {
>+        'values': ['ltr', 'rtl', 'inherit'],
>+        'initial': 'ltr',
>+      }],
>+      ['display', {
>+        'values': ['inline', 'block', 'list-item', 'inline-block', 'table', 'inline-table',
>+                   'table-row-group', 'table-header-group', 'table-footer-group', 'table-row',
>+                   'table-column-group', 'table-column', 'table-cell', 'table-caption', 'none',
>+                   'inherit'],
>+        'initial': 'inline',
>+      }],
>+      ['empty-cells', {
>+         'values': ['show', 'hide', 'inherit'],
>+         'initial': 'show',
>+      }],
>+      ['float', {
>+        'values': ['left', 'right', 'none', 'inherit'],
>+        'initial': 'none',
>+        'property': 'cssFloat',
>+      }],
>+      ['font-family', {
>+        'values': [family_name, generic_family, 'inherit'],
>+        'initial': 'sans-serif', //FIXME depends on user agent
>+      }],
>+      ['font-size', {
>+        'values': [absolute_size, relative_size, length, percentage, 'inherit'],
>+        'initial': 'medium',
>+      }],
>+      ['font-style', {
>+        'values': ['normal', 'italic', 'oblique', 'inherit'],
>+        'initial': 'normal',
>+      }],
>+      ['font-variant', {
>+        'values': ['normal', 'small-caps', 'inherit'],
>+        'initial': 'normal',
>+      }],
>+      ['font-weight', {
>+        'values': ['normal', 'bold', 'bolder', 'lighter', 100, 200, 300, 400, 500, 600,
>+                   700, 800, 900, 'inherit'],
>+        'initial': 'normal',
>+      }],
>+      //font
>+      ['height', {
>+        'values': [length, percentage, 'auto', 'inherit'],
>+        'initial': 'auto',
>+      }],
>+      ['left', {
>+        'values': [length, percentage, 'auto', 'inherit'],
>+        'initial': 'auto',
>+      }],
>+      ['letter-spacing', {
>+        'values': ['normal', length, 'inherit'],
>+        'initial': 'normal',
>+      }],
>+      ['line-height', {
>+        'values': ['normal', positive_number, length, percentage, 'inherit'],
>+        'initial': 'normal',
>+      }],
>+      ['list-style-image', {
>+        'values': [uri, 'none', 'inherit'],
>+        'initial': 'none',
>+      }],
>+      ['list-style-position', {
>+        'values': ['inside', 'outside', 'inherit'],
>+        'initial': 'outside',
>+      }],
>+      ['list-style-type', {
>+        'values': ['disc', 'circle', 'square', 'decimal', 'decimal-leading-zero', 'lower-roman',
>+                   'upper-roman', 'lower-greek', 'lower-latin', 'upper-latin', 'armenian', 'georgian',
>+                   'lower-alpha', 'upper-alpha', 'none', 'inherit'],
>+        'initial': 'disc',
>+      }],
>+      //list-style
>+      ['margin-right', {
>+        'values': [length, percentage, 'auto', 'inherit'],
>+        'initial': 0,
>+      }],
>+      ['margin-left', {
>+        'values': [length, percentage, 'auto', 'inherit'],
>+        'initial': 0,
>+      }],
>+      ['margin-top', {
>+        'values': [length, percentage, 'auto', 'inherit'],
>+        'initial': 0,
>+      }],
>+      ['margin-bottom', {
>+        'values': [length, percentage, 'auto', 'inherit'],
>+        'initial': 0,
>+      }],
>+      //margin
>+      ['max-height', {
>+        'values': [length, percentage, 'none', 'inherit'],
>+        'initial': 'none',
>+      }],
>+      ['max-width', {
>+        'values': [length, percentage, 'none', 'inherit'],
>+        'initial': 'none',
>+      }],
>+      ['min-height', {
>+        'values': [length, percentage, 'inherit'],
>+        'initial': 0,
>+      }],
>+      ['min-width', {
>+        'values': [length, percentage, 'inherit'],
>+        'initial': 0,
>+      }],
>+      ['orphans', {
>+        'values': [nonzero_positive_integer, 'inherit'],
>+        'initial': 2,
>+      }],
>+      ['outline-color', {
>+        'values': [color, 'invert', 'inherit'],
>+        'initial': 'invert',
>+      }],
>+      ['outline-style', {
>+        'values': [border_style_without_hidden, 'inherit'],
>+        'initial': 'none',
>+      }],
>+      ['outline-width', {
>+        'values': ['thin', 'medium', 'thick', length, 'inherit'],
>+        'initial': 'medium',
>+      }],
>+      //outline
>+      ['overflow', {
>+        'values': ['visible', 'hidden', 'scroll', 'auto', 'inherit'],
>+        'initial': 'visible',
>+      }],
>+      ['padding-top', {
>+        'values': [length, percentage, 'inherit'],
>+        'initial': 0,
>+      }],
>+      ['padding-right', {
>+        'values': [length, percentage, 'inherit'],
>+        'initial': 0,
>+      }],
>+      ['padding-bottom', {
>+        'values': [length, percentage, 'inherit'],
>+        'initial': 0,
>+      }],
>+      ['padding-left', {
>+        'values': [length, percentage, 'inherit'],
>+        'initial': 0,
>+      }],
>+      //padding
>+      ['page-break-after', {
>+        'values': ['auto', 'always', 'avoid', 'left', 'right', 'inherit'],
>+        'initial': 'auto',
>+      }],
>+      ['page-break-before', {
>+        'values': ['auto', 'always', 'avoid', 'left', 'right', 'inherit'],
>+        'initial': 'auto',
>+      }],
>+      ['page-break-inside', {
>+        'values': ['avoid', 'auto', 'inherit'],
>+        'initial': 'auto',
>+      }],
>+      ['position', {
>+        'values': ['static', 'relative', 'absolute', 'fixed', 'inherit'],
>+        'initial': 'static',
>+      }],
>+      //FIXME quotes
>+      ['right', {
>+        'values': [length, percentage, 'auto', 'inherit'],
>+        'initial': 'auto',
>+      }],
>+      ['table-layout', {
>+        'values': ['auto', 'fixed', 'inherit'],
>+        'initial': 'auto',
>+      }],
>+      ['text-align', {
>+        'values': ['left', 'right', 'center', 'justify', 'inherit'],
>+        'initial': null,
>+      }],
>+      ['text-decoration', {
>+        'values': ['none', 'underline', 'overline', 'line-through', 'blink', 'inherit'],
>+        'initial': 'none',
>+      }],
>+      ['text-indent', {
>+        'values': [length, percentage, 'inherit'],
>+        'initial': 0,
>+      }],
>+      ['text-transform', {
>+        'values': ['capitalize', 'uppercase', 'lowercase', 'none', 'inherit'],
>+        'initial': 'none',
>+      }],
>+      ['top', {
>+        'values': [length, percentage, 'auto', 'inherit'],
>+        'initial': 'auto',
>+      }],
>+      ['unicode-bidi', {
>+        'values': ['normal', 'embed', 'bidi-override', 'inherit'],
>+        'initial': 'normal',
>+      }],
>+      ['vertical-align', {
>+        'values': ['baseline', 'sub', 'super', 'top', 'text-top', 'middle', 'bottom', 'text-bottom',
>+                   percentage, length, 'inherit'],
>+        'initial': 'baseline',
>+      }],
>+      ['visibility', {
>+        'values': ['visible', 'hidden', 'collapse', 'inherit'],
>+        'initial': 'visible',
>+      }],
>+      ['white-space', {
>+        'values': ['normal', 'pre', 'nowrap', 'pre-wrap', 'pre-line', 'inherit'],
>+        'initial': 'normal',
>+      }],
>+      ['widows', {
>+        'values': [nonzero_positive_integer, 'inherit'],
>+        'initial': 2,
>+      }],
>+      ['width', {
>+        'values': [length, percentage, 'auto', 'inherit'],
>+        'initial': 'auto',
>+      }],
>+      ['word-spacing', {
>+        'values': ['normal', length, 'inherit'],
>+        'initial': 'normal',
>+      }],
>+      ['z-index', {
>+        'values': ['auto', integer, 'inherit'],
>+        'initial': 'auto',
>+      }],
>+    ]
>+
>+    for (var index = 0; index < properties.length; index++) {
>+      test_property(properties[index]);
>+    }
>+  </script>
>+</body>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-variable-reference-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-variable-reference-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..b95e917dda782cc0fa1501a84fc973ead99a178d
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-variable-reference-expected.txt
>@@ -0,0 +1,6 @@
>+
>+PASS Longhand with variable preserves original serialization: with whitespace 
>+PASS Shorthand with variable preserves original serialization: with whitespace 
>+FAIL Longhand with variable preserves original serialization: without whitespace assert_equals: expected "font-size:var(--a);" but got "font-size: var(--a);"
>+FAIL Shorthand with variable preserves original serialization: without whitespace assert_equals: expected "font:var(--a);" but got "font: var(--a);"
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-variable-reference.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-variable-reference.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..30eeca986d0e77734341d04319100e3ad32198df
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-variable-reference.html
>@@ -0,0 +1,36 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>CSSOM - Serialization with variable preserves original serialization.</title>
>+<link rel="help" href="https://drafts.csswg.org/css-variables/#serializing-custom-props">
>+<link rel="help" href="https://drafts.csswg.org/css-variables/#variables-in-shorthands">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<div id="longhand-whitespace" style="font-size: var(--a);"></div>
>+<div id="shorthand-whitespace" style="font: var(--a);"></div>
>+<div id="longhand" style="font-size:var(--a);"></div>
>+<div id="shorthand" style="font:var(--a);"></div>
>+<script>
>+    test(function() {
>+        var elem = document.getElementById('longhand-whitespace');
>+
>+        assert_equals(elem.style.cssText, 'font-size: var(--a);');
>+    }, 'Longhand with variable preserves original serialization: with whitespace')
>+
>+    test(function() {
>+        var elem = document.getElementById('shorthand-whitespace');
>+
>+        assert_equals(elem.style.cssText, 'font: var(--a);');
>+    }, 'Shorthand with variable preserves original serialization: with whitespace')
>+
>+    test(function() {
>+        var elem = document.getElementById('longhand');
>+
>+        assert_equals(elem.style.cssText, 'font-size:var(--a);');
>+    }, 'Longhand with variable preserves original serialization: without whitespace')
>+
>+    test(function() {
>+        var elem = document.getElementById('shorthand');
>+
>+        assert_equals(elem.style.cssText, 'font:var(--a);');
>+    }, 'Shorthand with variable preserves original serialization: without whitespace')
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/setproperty-null-undefined-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/setproperty-null-undefined-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..2a91baf3406cb2f6f471dc7d38ee640d4bc2bf61
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/setproperty-null-undefined-expected.txt
>@@ -0,0 +1,6 @@
>+
>+PASS Verify that setting a CSS property to undefined has no effect. 
>+PASS Verify that setting a CSS property priority to undefined is accepted. 
>+PASS Verify that setting a CSS property to null is treated like empty string. 
>+PASS Verify that setting a CSS property priority to null is treated like empty string. 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/setproperty-null-undefined.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/setproperty-null-undefined.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..c1d51629933c26ccf19fb6bef1e06af281a8e7cd
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/setproperty-null-undefined.html
>@@ -0,0 +1,47 @@
>+<!doctype html>
>+<html>
>+<head>
>+<link rel="help" href="https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-setproperty"/>
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+</head>
>+<body>
>+<script>
>+var style = document.body.style;
>+
>+test(function() {
>+    style.color = 'white';
>+
>+    assert_equals(style.color, 'white');
>+    style.setProperty('color', undefined);
>+    assert_equals(style.color, 'white');
>+}, "Verify that setting a CSS property to undefined has no effect.");
>+
>+test(function() {
>+    style.color = 'white';
>+
>+    assert_equals(style.color, 'white');
>+    assert_equals(style.getPropertyPriority('color'), '');
>+    style.setProperty('color', 'red', undefined);
>+    assert_equals(style.color, 'red');
>+    assert_equals(style.getPropertyPriority('color'), '');
>+}, "Verify that setting a CSS property priority to undefined is accepted.");
>+
>+test(function() {
>+    style.color = 'white';
>+
>+    assert_equals(style.color, 'white');
>+    style.setProperty('color', null);
>+    assert_equals(style.color, '');
>+}, "Verify that setting a CSS property to null is treated like empty string.");
>+
>+test(function() {
>+    style.color = 'white';
>+
>+    assert_equals(style.color, 'white');
>+    style.setProperty('color', 'red', null);
>+    assert_equals(style.color, 'red');
>+}, "Verify that setting a CSS property priority to null is treated like empty string.");
>+</script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-serialization-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-serialization-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..369d53047d26d136b6316e5321357b732bfebea6
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-serialization-expected.txt
>@@ -0,0 +1,13 @@
>+foo
>+foo
>+foo
>+foo
>+foo
>+foo
>+foo
>+
>+PASS Shorthand serialization with shorthand and longhands mixed. 
>+PASS Shorthand serialization with just longhands. 
>+FAIL Shorthand serialization with variable and variable from other shorthand. assert_equals: expected "var(--a)" but got ""
>+PASS Shorthand serialization after setting 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-serialization.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-serialization.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..095f0a4553a1212796a06546d9af5abec568953f
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-serialization.html
>@@ -0,0 +1,63 @@
>+<!doctype html>
>+<html>
>+<head>
>+    <meta charset="utf-8">
>+    <title>Shorthand serialization should be done correctly.</title>
>+    <link rel="help" href="https://drafts.csswg.org/cssom/#serialize-a-css-declaration-block">
>+    <link rel="help" href="https://drafts.csswg.org/css-variables/#variables-in-shorthands">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+</head>
>+<body>
>+    <div id="foo1" style="background: red;">foo</div>
>+    <div id="foo2" style="background-color: blue; background: red !important; background-color: green;">foo</div>
>+    <div id="foo3" style="background-color: blue; background: red; background-color: green !important;">foo</div>
>+
>+    <div id="foo4" style="margin-right: 10px; margin-left: 10px; margin-top: 10px; margin-bottom: 10px;">foo</div>
>+    <div id="foo5" style="margin-right: 10px; margin-left: 10px; margin-top: 10px; margin-bottom: 10px!important;">foo</div>
>+    <div id="foo6" style="margin-right: 10px !important; margin-left: 10px !important; margin-top: 10px !important; margin-bottom: 10px!important;">foo</div>
>+
>+    <div id="foo7" style="background:var(--a);">foo</div>
>+    <div id="test"></div>
>+
>+    <script>
>+        test(function() {
>+            var elem1 = document.getElementById('foo1');
>+            var elem2 = document.getElementById('foo2');
>+            var elem3 = document.getElementById('foo3');
>+
>+            assert_false(elem1.style.cssText.endsWith('!important;'));
>+            assert_true(elem2.style.cssText.endsWith('!important;'));
>+            assert_false(elem3.style.background.endsWith('!important'));
>+
>+        }, "Shorthand serialization with shorthand and longhands mixed.");
>+
>+        test(function() {
>+            var elem4 = document.getElementById('foo4');
>+            var elem5 = document.getElementById('foo5');
>+            var elem6 = document.getElementById('foo6');
>+
>+            assert_equals(elem4.style.cssText, 'margin: 10px;');
>+            assert_equals(elem4.style.margin, '10px');
>+            assert_equals(elem5.style.cssText, 'margin-right: 10px; margin-left: 10px; margin-top: 10px; margin-bottom: 10px !important;');
>+            assert_equals(elem5.style.margin, '');
>+            assert_equals(elem6.style.cssText, 'margin: 10px !important;');
>+            assert_equals(elem6.style.margin, '10px');
>+        }, "Shorthand serialization with just longhands.");
>+
>+        test(function() {
>+          var elem7 = document.getElementById('foo7');
>+
>+          assert_equals(elem7.style.background, 'var(--a)');
>+          assert_equals(elem7.style.backgroundPosition, '');
>+        }, "Shorthand serialization with variable and variable from other shorthand.");
>+
>+        test(function() {
>+            var testElem = document.getElementById("test");
>+            testElem.style.margin = "20px 20px 20px 20px";
>+            assert_equals(testElem.style.margin, "20px");
>+            assert_equals(testElem.style.cssText, "margin: 20px;")
>+        }, "Shorthand serialization after setting");
>+    </script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-values-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-values-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..98037d9f2e5b88fd3e49327bbc02b4a0b20da7a7
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-values-expected.txt
>@@ -0,0 +1,21 @@
>+
>+PASS The serialization of border: 1px; border-top: 1px; should be canonical. 
>+PASS The serialization of border: 1px solid red; should be canonical. 
>+PASS The serialization of border: 1px red; should be canonical. 
>+PASS The serialization of border: red; should be canonical. 
>+PASS The serialization of border-top: 1px; border-right: 1px; border-bottom: 1px; border-left: 1px; should be canonical. 
>+PASS The serialization of border-top: 1px; border-right: 2px; border-bottom: 3px; border-left: 4px; should be canonical. 
>+PASS The serialization of border: 1px; border-top: 2px; should be canonical. 
>+PASS The serialization of border: 1px; border-top: 1px !important; should be canonical. 
>+PASS The serialization of border: 1px; border-top-color: red; should be canonical. 
>+PASS The serialization of border: solid; border-style: dotted should be canonical. 
>+PASS The serialization of border-width: 1px; should be canonical. 
>+FAIL The serialization of overflow-x: scroll; overflow-y: hidden; should be canonical. assert_equals: expected "overflow: scroll hidden;" but got "overflow-x: scroll; overflow-y: hidden;"
>+PASS The serialization of overflow-x: scroll; overflow-y: scroll; should be canonical. 
>+PASS The serialization of outline-width: 2px; outline-style: dotted; outline-color: blue; should be canonical. 
>+PASS The serialization of margin-top: 1px; margin-right: 2px; margin-bottom: 3px; margin-left: 4px; should be canonical. 
>+PASS The serialization of list-style-type: circle; list-style-position: inside; list-style-image: initial; should be canonical. 
>+PASS The serialization of list-style-type: lower-alpha; should be canonical. 
>+PASS The serialization of font-family: sans-serif; line-height: 2em; font-size: 3em; font-style: italic; font-weight: bold; should be canonical. 
>+PASS The serialization of padding-top: 1px; padding-right: 2px; padding-bottom: 3px; padding-left: 4px; should be canonical. 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-values.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-values.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..db11320ad5aaceda963f7eaae09550d42447210f
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-values.html
>@@ -0,0 +1,50 @@
>+<!doctype html>
>+<head>
>+  <title>CSS OM: CSS Values</title>
>+  <link rel="author" title="Divya Manian" href="mailto:manian@adobe.com">
>+  <link rel="help" href="https://drafts.csswg.org/cssom/#serialize-a-css-declaration-block">
>+  <meta name="flags" content="dom">
>+  <meta name="assert" content="Testing Serialization of Shorthand Values">
>+  <script src="../../../../../resources/testharness.js"></script>
>+  <script src="../../../../../resources/testharnessreport.js"></script>
>+</head>
>+<body>
>+    <div id="test"></div>
>+    <script>
>+      function test_shorthand_serialization(value, expected) {
>+        test(function() {
>+          const div = document.getElementById("test");
>+          div.style.cssText = value;
>+          assert_equals(div.style.cssText, expected);
>+        }, "The serialization of " + value + " should be canonical.");
>+      }
>+
>+      var tests = {
>+        // specified -> expected
>+        'border: 1px; border-top: 1px;': 'border: 1px;',
>+        'border: 1px solid red;': 'border: 1px solid red;',
>+        'border: 1px red;': 'border: 1px red;',
>+        'border: red;': 'border: red;',
>+        'border-top: 1px; border-right: 1px; border-bottom: 1px; border-left: 1px;': 'border: 1px;',
>+        'border-top: 1px; border-right: 2px; border-bottom: 3px; border-left: 4px;': 'border-width: 1px 2px 3px 4px;',
>+        'border: 1px; border-top: 2px;': 'border-width: 2px 1px 1px;',
>+        'border: 1px; border-top: 1px !important;': 'border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px; border-top-width: 1px !important;',
>+        'border: 1px; border-top-color: red;': 'border-width: 1px; border-top-color: red;',
>+        'border: solid; border-style: dotted': 'border: dotted;',
>+        'border-width: 1px;': 'border-width: 1px;',
>+        'overflow-x: scroll; overflow-y: hidden;': 'overflow: scroll hidden;',
>+        'overflow-x: scroll; overflow-y: scroll;': 'overflow: scroll;',
>+        'outline-width: 2px; outline-style: dotted; outline-color: blue;': 'outline: blue dotted 2px;',
>+        'margin-top: 1px; margin-right: 2px; margin-bottom: 3px; margin-left: 4px;': 'margin: 1px 2px 3px 4px;',
>+        'list-style-type: circle; list-style-position: inside; list-style-image: initial;': 'list-style: circle inside;',
>+        'list-style-type: lower-alpha;': 'list-style-type: lower-alpha;',
>+        'font-family: sans-serif; line-height: 2em; font-size: 3em; font-style: italic; font-weight: bold;': 'font-family: sans-serif; line-height: 2em; font-size: 3em; font-style: italic; font-weight: bold;',
>+        'padding-top: 1px; padding-right: 2px; padding-bottom: 3px; padding-left: 4px;': 'padding: 1px 2px 3px 4px;'
>+      }
>+
>+      for (let test in tests) {
>+        test_shorthand_serialization(test, tests[test]);
>+      }
>+    </script>
>+ </body>
>+ </html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-001-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-001-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..bff562204870e9499028961e249043a882c952c6
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-001-expected.txt
>@@ -0,0 +1,8 @@
>+
>+PASS sheet_property 
>+PASS sheet_property_updates 
>+PASS CSSStyleSheet_properties 
>+PASS CSSStyleSheet_property_values 
>+PASS StyleSheet_properties 
>+PASS StyleSheet_property_values 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-001.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-001.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..12f4bd81ecdc925a429c28a84074d5b18be6f31a
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-001.html
>@@ -0,0 +1,113 @@
>+<!DOCTYPE html>
>+<html>
>+ <head>
>+  <title>CSS Test: CSSOM StyleSheet Initial Values</title>
>+  <link rel="author" title="Bear Travis" href="mailto:betravis@adobe.com">
>+  <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-style-sheets">
>+  <meta name="flags" content="dom">
>+  <meta name="assert" content="StyleSheet and CSSStyleSheet objects have the properties specified in their interfaces">
>+  <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+  <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+  <style id="styleElement" type="text/css" media="all" title="internal style sheet" disabled="disabled">
>+    @import url('support/a-green.css');
>+    * { margin: 0; padding: 0; }
>+  </style>
>+  <link id="linkElement" rel="stylesheet" href="support/b-green.css">
>+ </head>
>+ <body>
>+  <noscript>Test not run - javascript required.</noscript>
>+  <div id="log"></div>
>+  <script type="text/javascript">
>+    var styleElement = document.getElementById("styleElement");
>+    var linkElement = document.getElementById("linkElement");
>+
>+    var styleSheet;
>+    var linkSheet;
>+    test(function() {
>+        assert_idl_attribute(styleElement, "sheet");
>+        assert_readonly(styleElement, "sheet");
>+        styleSheet = styleElement.sheet;
>+        assert_true(styleSheet instanceof CSSStyleSheet);
>+        assert_idl_attribute(linkElement, "sheet");
>+        linkSheet = linkElement.sheet;
>+        assert_true(linkSheet instanceof CSSStyleSheet);
>+    }, "sheet_property",
>+    { help: "http://www.w3.org/TR/cssom-1/#the-linkstyle-interface",
>+      assert: [ "styleElement.sheet exists", "styleElement.sheet is a CSSStyleSheet",
>+                "linkElement.sheet exists", "linkElement.sheet is a CSSStyleSheet"] });
>+
>+    test(function () {
>+      var style = document.createElement("style");
>+      document.querySelector("head").appendChild(style);
>+      var sheet1 = style.sheet;
>+      assert_equals(sheet1.cssRules.length, 0);
>+      style.appendChild(document.createTextNode("a { color: green; }"));
>+      assert_equals(style.sheet.cssRules.length, 1);
>+    }, "sheet_property_updates",
>+    { help: "https://www.w3.org/TR/cssom-1/#the-linkstyle-interface",
>+      assert: "The sheet property on LinkStyle should always return the current associated style sheet." });
>+
>+    test(function() {
>+        assert_idl_attribute(styleSheet, "ownerRule");
>+        assert_idl_attribute(styleSheet, "cssRules");
>+        assert_inherits(styleSheet, "insertRule");
>+        assert_inherits(styleSheet, "deleteRule");
>+
>+        assert_readonly(styleSheet, "ownerRule");
>+        assert_readonly(styleSheet, "cssRules");
>+    }, "CSSStyleSheet_properties",
>+    { assert: [ "ownerRule, cssRules, insertRule and deleteRule properties exist on CSSStyleSheet",
>+                "ownerRule, cssRules are read only"] });
>+
>+    var importSheet;
>+    test(function() {
>+        assert_equals(styleSheet.ownerRule, null);
>+        assert_true(styleSheet.cssRules.length > 0);
>+        assert_true(styleSheet.cssRules.item(0) instanceof CSSImportRule);
>+        importSheet = styleSheet.cssRules.item(0).styleSheet;
>+    }, "CSSStyleSheet_property_values",
>+    { help: [ "http://www.w3.org/TR/cssom-1/#css-style-sheets",
>+              "http://www.w3.org/TR/cssom-1/#cssimportrule" ],
>+      assert: "CSSStyleSheet initial property values are correct" });
>+
>+    test(function() {
>+        assert_idl_attribute(styleSheet, "type");
>+        assert_idl_attribute(styleSheet, "disabled");
>+        assert_idl_attribute(styleSheet, "ownerNode");
>+        assert_idl_attribute(styleSheet, "parentStyleSheet");
>+        assert_idl_attribute(styleSheet, "href");
>+        assert_idl_attribute(styleSheet, "title");
>+        assert_idl_attribute(styleSheet, "media");
>+
>+        assert_readonly(styleSheet, "type");
>+        assert_readonly(styleSheet, "ownerNode");
>+        assert_readonly(styleSheet, "parentStyleSheet");
>+        assert_readonly(styleSheet, "href");
>+        assert_readonly(styleSheet, "title");
>+    }, "StyleSheet_properties",
>+    { assert: [ "type, disabled, ownerNode, parentStyleSheet, href, title, and media properties exist on StyleSheet",
>+                "type, ownerNode, parentStyleSheet, href, and title properties are read only" ] });
>+
>+    test(function() {
>+        assert_equals(styleSheet.type, "text/css");
>+        assert_equals(styleSheet.disabled, false);
>+
>+        assert_equals(styleSheet.ownerNode, styleElement);
>+        assert_equals(linkSheet.ownerNode, linkElement);
>+        assert_equals(importSheet.ownerNode, null);
>+
>+        assert_equals(styleSheet.href, null);
>+        assert_regexp_match(linkSheet.href, /support\/b-green.css$/);
>+        assert_regexp_match(importSheet.href, /support\/a-green.css$/);
>+
>+        assert_equals(styleSheet.parentStyleSheet, null);
>+        assert_equals(linkSheet.parentStyleSheet, null);
>+        assert_equals(importSheet.parentStyleSheet, styleSheet);
>+
>+        assert_equals(styleSheet.title, "internal style sheet");
>+        assert_equals(styleSheet.media.item(0), "all");
>+    }, "StyleSheet_property_values",
>+    { assert: "StyleSheet initial property values are correct" });
>+  </script>
>+ </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-002-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-002-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..4b53120569b32912dfa7b7b40866ab7a5d60c952
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-002-expected.txt
>@@ -0,0 +1,4 @@
>+
>+PASS add_rule 
>+PASS delete_rule 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-002.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-002.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..a09f5862fa25312552270145511ac9dce5a4fb59
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-002.html
>@@ -0,0 +1,42 @@
>+<!DOCTYPE html>
>+<html>
>+ <head>
>+  <title>CSS Test: CSSOM StyleSheet Modify Rule List</title>
>+  <link rel="author" title="Bear Travis" href="mailto:betravis@adobe.com">
>+  <link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> 
>+  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstylesheet-interface">
>+  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>+  <meta name="flags" content="dom">
>+  <meta name="assert" content="StyleSheet and CSSStyleSheet objects have the properties specified in their interfaces">
>+  <script src="../../../../../resources/testharness.js" type="text/javascript"></script>
>+  <script src="../../../../../resources/testharnessreport.js" type="text/javascript"></script>
>+  <style id="styleElement" type="text/css" media="all" title="internal style sheet" disabled="disabled">
>+    * { margin: 0; padding: 0; }
>+  </style>
>+ </head>
>+ <body>
>+  <noscript>Test not run - javascript required.</noscript>
>+  <div id="log"></div>
>+  <script type="text/javascript">
>+  var sheet = document.getElementById("styleElement").sheet;
>+  test(function() {
>+    assert_equals(sheet.cssRules.length, 1);
>+    sheet.insertRule("p { color: green; }", 0);
>+    assert_equals(sheet.cssRules.length, 2);
>+    assert_equals(sheet.cssRules.item(0).cssText, "p { color: green; }");
>+  }, "add_rule", {
>+    assert: [   "Initial rule list is of size 1",
>+                "Can add a rule at first index" ]
>+  });
>+
>+  test(function() {
>+    sheet.deleteRule(0);
>+    assert_equals(sheet.cssRules.length, 1);
>+    sheet.deleteRule(0);
>+    assert_equals(sheet.cssRules.length, 0);
>+  }, "delete_rule", {
>+    assert: "Can delete rules until rule list is empty"
>+  });
>+  </script>
>+ </body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-replacedata-dynamic-expected.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-replacedata-dynamic-expected.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..bc9cadebf15d720e9c89b8072c0ef36eca962343
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-replacedata-dynamic-expected.html
>@@ -0,0 +1,7 @@
>+<!doctype html>
>+<title>(Ref #1) CSS Test Reference</title>
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@mozilla.com">
>+<link rel="author" title="Cheng You Bai" href="mailto:cyb.ai.815@gmail.com">
>+<link rel="help" href="https://dom.spec.whatwg.org/#dom-characterdata-replacedata">
>+<style>.pass { color: green }</style>
>+<div class="pass">Should be green</div>
>\ No newline at end of file
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-replacedata-dynamic.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-replacedata-dynamic.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..3ee5937c9591189f80d36a315272107fae720805
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-replacedata-dynamic.html
>@@ -0,0 +1,12 @@
>+<!doctype html>
>+<title>(Test #1) CSS Test: Dynamic changes to the stylesheet contents using replaceData are reflected</title>
>+<link rel="match" href="stylesheet-replacedata-dynamic-ref.html">
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@mozilla.com">
>+<link rel="author" title="Cheng You Bai" href="mailto:cyb.ai.815@gmail.com">
>+<link rel="help" href="https://dom.spec.whatwg.org/#dom-characterdata-replacedata">
>+<style>.fail { color: green }</style>
>+<div class="pass">Should be green</div>
>+<script>
>+  document.body.offsetTop;
>+  document.querySelector('style').firstChild.replaceData(1, 4, "pass");
>+</script>
>\ No newline at end of file
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-same-origin.css b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-same-origin.css
>new file mode 100644
>index 0000000000000000000000000000000000000000..d61a8dd67c9e74e7ca620f08dc1bd2ed1998fa8f
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-same-origin.css
>@@ -0,0 +1,3 @@
>+body {
>+    padding: 10px;
>+}
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-same-origin.sub-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-same-origin.sub-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..1616078928abb11fb59f76b186a045ce7b906b2d
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-same-origin.sub-expected.txt
>@@ -0,0 +1,9 @@
>+Blocked access to external URL http://www1.localhost:8801/stylesheet-same-origin.css
>+Blocked access to external URL http://www1.localhost:8801/stylesheet-same-origin.css
>+
>+FAIL Origin-clean check in cross-origin CSSOM Stylesheets assert_throws: Cross origin stylesheet.cssRules should throw SecurityError. function "function () {
>+                    crossorigin.cssRules;
>+                }" threw object "TypeError: null is not an object (evaluating 'crossorigin.cssRules')" that is not a DOMException SecurityError: property "code" is equal to undefined, expected 18
>+PASS Origin-clean check in same-origin CSSOM Stylesheets 
>+FAIL Origin-clean check in data:css CSSOM Stylesheets null is not an object (evaluating 'sheet.cssRules.length')
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-same-origin.sub.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-same-origin.sub.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..4611eebf82e8072a2ad93dcb8a54de41c07b90d6
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-same-origin.sub.html
>@@ -0,0 +1,57 @@
>+<!doctype html>
>+<html>
>+<head>
>+    <meta charset="utf-8">
>+    <title>CSSOM - CSSStylesheet should support origins</title>
>+    <link rel="help" href="https://drafts.csswg.org/cssom/#the-cssstylesheet-interface">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+
>+    <link id="crossorigin" href="http://www1.{{host}}:{{ports[http][1]}}/stylesheet-same-origin.css" rel="stylesheet">
>+    <link id="sameorigin" href="stylesheet-same-origin.css" rel="stylesheet">
>+    <link id="sameorigindata" href="data:text/css,.green-text{color:rgb(0, 255, 0)}" rel="stylesheet">
>+
>+    <script>
>+        var crossorigin = document.getElementById("crossorigin").sheet;
>+        var sameorigin = document.getElementById("sameorigin").sheet;
>+        var sameorigindata = document.getElementById("sameorigindata").sheet;
>+
>+        test(function() {
>+            assert_throws("SecurityError",
>+                function () {
>+                    crossorigin.cssRules;
>+                },
>+                "Cross origin stylesheet.cssRules should throw SecurityError.");
>+            assert_throws("SecurityError",
>+                function () {
>+                    crossorigin.insertRule("#test { margin: 10px; }", 1);
>+                },
>+                "Cross origin stylesheet.insertRule should throw SecurityError.");
>+
>+            assert_throws("SecurityError",
>+                function () {
>+                    crossorigin.deleteRule(0);
>+                },
>+                "Cross origin stylesheet.deleteRule should throw SecurityError.");
>+        }, "Origin-clean check in cross-origin CSSOM Stylesheets");
>+
>+        function doOriginCleanCheck(sheet, name) {
>+            assert_equals(sheet.cssRules.length, 1, name + " stylesheet.cssRules should be accessible.");
>+            sheet.insertRule("#test { margin: 10px; }", 1);
>+            assert_equals(sheet.cssRules.length, 2, name + " stylesheet.insertRule should be accessible.");
>+            sheet.deleteRule(0);
>+            assert_equals(sheet.cssRules.length, 1, name + " stylesheet.deleteRule should be accessible.");
>+        }
>+
>+        test(function() {
>+            doOriginCleanCheck(sameorigin, "Same-origin");
>+        }, "Origin-clean check in same-origin CSSOM Stylesheets");
>+
>+        test(function() {
>+            doOriginCleanCheck(sameorigindata, "data:css");
>+        }, "Origin-clean check in data:css CSSOM Stylesheets");
>+
>+    </script>
>+</head>
>+<body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-title-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-title-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..7636d29ed13b7c5c428af2d9047037a934ad1efc
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-title-expected.txt
>@@ -0,0 +1,6 @@
>+Should be green
>+
>+
>+PASS Preferred style sheet name 
>+FAIL StyleSheet.title assert_equals: expected 4 but got 3
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-title.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-title.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..8c6f86a8f0e48119fda70fa5f96802864398d45d
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-title.html
>@@ -0,0 +1,39 @@
>+<!doctype html>
>+<meta charset="utf-8">
>+<title>CSS Test: StyleSheet's title attribute</title>
>+<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@crisal.io">
>+<link rel="help" href="https://drafts.csswg.org/cssom/#preferred-css-style-sheet-set-name">
>+<link rel="help" href="https://html.spec.whatwg.org/multipage/#attr-style-title">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<style></style>
>+<style title=""></style>
>+<style title="Preferred">
>+  p { color: green; }
>+</style>
>+<style title="Not preferred">
>+  p { color: red; }
>+</style>
>+<p id="test-element">Should be green</p>
>+<script>
>+test(function() {
>+  assert_equals(
>+    getComputedStyle(document.getElementById("test-element")).color,
>+    "rgb(0, 128, 0)",
>+    "Preferred style should apply"
>+  );
>+}, "Preferred style sheet name");
>+
>+test(function() {
>+  let sheets = document.styleSheets;
>+  let styleElements = Array.from(document.querySelectorAll("style"));
>+  assert_equals(sheets.length, styleElements.length);
>+  for (let i = 0; i < sheets.length; ++i) {
>+    let titleAttr = styleElements[i].getAttribute("title");
>+    if (titleAttr === null || titleAttr === "")
>+      assert_equals(sheets[i].title, null, "Empty title returns null");
>+    else
>+      assert_equals(sheets[i].title, titleAttr, "Selected title is properly reflected");
>+  }
>+}, "StyleSheet.title");
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/1x1-green.png b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/1x1-green.png
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>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/README b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/README
>new file mode 100644
>index 0000000000000000000000000000000000000000..2e5f2ad0738c58dfdf7b368d1fff7aca4f797156
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/README
>@@ -0,0 +1,28 @@
>+CSS Global Support Directory
>+============================
>+
>+This directory contains common support files (such as images and external
>+style sheets). These are sync'ed into the support directories of all our
>+test suites. If you have test-suite-specific support files, please add
>+them to the appropriate test-suite-specific support/ directory.
>+
>+If you add to a support/ directory, please run the tools/supportprop.py
>+script from the top of the repository to cascade support files into the
>+lower-level support directories.
>+
>+Description of the Common Support File Collection
>+-------------------------------------------------
>+
>+The 1x1-* images are all exactly one pixel.
>+
>+The swatch-* images all use 15x15 cells.
>+
>+The square-* images all use 15x15 cells with one pixel borders.
>+
>+The pattern-* images use cells of various sizes:
>+
>+   pattern-grg-rgr-grg.png   20x20
>+   pattern-rgr-grg-rgr.png   20x20
>+   pattern-tr.png            15x15
>+   pattern-grg-rrg-rgg.png   15x15
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/a-green.css b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/a-green.css
>new file mode 100644
>index 0000000000000000000000000000000000000000..b0dbb071d5b05d1c574cd5c9a660f1e3d62c573b
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/a-green.css
>@@ -0,0 +1 @@
>+.a { color: green; }
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/b-green.css b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/b-green.css
>new file mode 100644
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>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/b-green.css
>@@ -0,0 +1 @@
>+.b { color: green; }
>\ No newline at end of file
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/c-red.css b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/c-red.css
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>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/c-red.css
>@@ -0,0 +1 @@
>+.c { color: red; }
>\ No newline at end of file
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>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/import-charset.css b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/import-charset.css
>new file mode 100644
>index 0000000000000000000000000000000000000000..9f44090c94a7945c3adbf850da3290c85a60a0ab
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/import-charset.css
>@@ -0,0 +1 @@
>+@charset "UTF-8";
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/import-green.css b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/import-green.css
>new file mode 100644
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>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/import-green.css
>@@ -0,0 +1 @@
>+.import { color: green; }
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/import-red.css b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/import-red.css
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>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/import-red.css
>@@ -0,0 +1 @@
>+.import { color: red; }
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/pattern-grg-rgr-grg.png b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/pattern-grg-rgr-grg.png
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>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/support/README b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/support/README
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>@@ -0,0 +1,4 @@
>+The swatch-green.png file in this directory is really a RED swatch,
>+and the swatch-red.png file is really a green swatch.
>+
>+This directory is used to test relative URIs.
>\ No newline at end of file
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>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/support/w3c-import.log b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/support/w3c-import.log
>new file mode 100644
>index 0000000000000000000000000000000000000000..3339ce4408c19a6a8b0fcde1a24339a2b3701b99
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/support/w3c-import.log
>@@ -0,0 +1,19 @@
>+The tests in this directory were imported from the W3C repository.
>+Do NOT modify these tests directly in WebKit.
>+Instead, create a pull request on the WPT github:
>+	https://github.com/w3c/web-platform-tests
>+
>+Then run the Tools/Scripts/import-w3c-tests in WebKit to reimport
>+
>+Do NOT modify or remove this file.
>+
>+------------------------------------------------------------------------
>+Properties requiring vendor prefixes:
>+None
>+Property values requiring vendor prefixes:
>+None
>+------------------------------------------------------------------------
>+List of files:
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/support/README
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/support/swatch-green.png
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>zN?{sklqJk*eYL?f(2HA43tsrLxw#P83GW(do-aa9$Cseyd*a!d^}6HVyqYAe5u#PP
>zW%Z*kP*_6LlYHvTg7zzOR0H&%9HKkXNYMzhoi|%+O@~02w{IClNzOR!w=8e?lQnb@
>z%pq|-dqh2QW;SdM6#?$Yk>1_eQZqwfj_k!6`W4$RXtT;($sb=Vf=Ltr<fHQ=Orru;
>zUn;qEfp&3@JVRc|I^G&)9Ni4A9mSQOHEM$Fe1C)nz8+lD!g*#oEk#T?Ym^*pUDLa@
>zP0fmiPIHK0vlU}q+Y5`}FTpe9;sq1LWPGS!Et$V!6C--}V}{^za7DM=t4WauJA@K$
>zMP={GAs~J}TSO4+Obz2!!c-2PJ^BD}6(L7%qhFFWlm_w*{A_jB&gyf79BgCs?>w9n
>z=2B#u(Pr7sL0tWekex*^{dF&8!>RY)KGWH*ffTXTQc}}ioq82%jI{MEgls^5+h<%O
>z^>H1Z@tJtBVk*~XX#88aM!5hI=gDs?hBhOj+jXMvWV-~H?(^Z!I&l*r!fNriI&I;K
>z<Iv6+Vk^Q0%(qeN5a+0NAxn^9#sT%s+L9uce-sc;vjLIT_kg$%QSX=-v{o_lKqih2
>zSFAju?}mC>UB`|wTQ4r~E*vl-*0C6Qu@PH2eTrR0Wf{T~%Xbknf3wf*S&<+a`6o9M
>zz*S7^KKgFY$UnJ0HVgZg8jXfF%*c<rs4-Jtxk{$Dr$zap4viTq<*Snt>L({(KZLbt
>zzRNL^s?W;zZP~w5L&>g+M15Ai**#&3n|Wb>4eGP<`;PGlMsC0muRbf^cs3p5##&fh
>zIr(FkMaZ}vrt)1Swj2@$kLqXgyORsRw`3xZBX}-f+RL=$<nPGNDtben%J*+U`~KZM
>xFqlMZdn&(j3r#(mcWQ87&CEBe=q+_3|9^_Lp+#u>Ntgft002ovPDHLkV1lbeOeO#T
>
>literal 0
>HcmV?d00001
>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/w3c-import.log b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/w3c-import.log
>new file mode 100644
>index 0000000000000000000000000000000000000000..11b5168acb5cd471f0d98dc727214a7502720755
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/w3c-import.log
>@@ -0,0 +1,59 @@
>+The tests in this directory were imported from the W3C repository.
>+Do NOT modify these tests directly in WebKit.
>+Instead, create a pull request on the WPT github:
>+	https://github.com/w3c/web-platform-tests
>+
>+Then run the Tools/Scripts/import-w3c-tests in WebKit to reimport
>+
>+Do NOT modify or remove this file.
>+
>+------------------------------------------------------------------------
>+Properties requiring vendor prefixes:
>+None
>+Property values requiring vendor prefixes:
>+None
>+------------------------------------------------------------------------
>+List of files:
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/1x1-green.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/1x1-lime.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/1x1-maroon.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/1x1-navy.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/1x1-red.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/1x1-white.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/60x60-gg-rr.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/60x60-green.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/60x60-red.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/README
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/a-green.css
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/b-green.css
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/c-red.css
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/cat.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/import-charset.css
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/import-green.css
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/import-red.css
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/pattern-grg-rgr-grg.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/pattern-grg-rrg-rgg.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/pattern-rgr-grg-rgr.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/pattern-tr.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/ruler-h-50%.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/ruler-h-50px.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/ruler-v-100px.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/ruler-v-50px.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/square-purple.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/square-teal.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/square-white.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/swatch-blue.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/swatch-green.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/swatch-lime.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/swatch-orange.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/swatch-red.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/swatch-teal.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/swatch-white.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/swatch-yellow.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/test-bl.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/test-br.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/test-inner-half-size.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/test-outer.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/test-tl.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/test-tr.png
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/xmlss-pi.xhtml
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/xmlss-pi.xhtml b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/xmlss-pi.xhtml
>new file mode 100644
>index 0000000000000000000000000000000000000000..8e22b50b25a5458d832e31bb3c61e0ed881fb59c
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/support/xmlss-pi.xhtml
>@@ -0,0 +1 @@
>+<?xml-stylesheet href='data:text/css,'?><html xmlns='http://www.w3.org/1999/xhtml'/>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..bcf4b947450d2a714aae9ba4c0b18bc2e3426edf
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count-expected.txt
>@@ -0,0 +1,5 @@
>+
>+PASS stylesheet.css should be loaded and styleSheets.length === 1 
>+PASS stylesheet.css should be unloaded and styleSheets.length === 0 
>+FAIL stylesheet-1.css should be loaded and styleSheets.length === 1 assert_equals: styleSheets.length is incorrect: expected 1 but got 0
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..24c5dcd7c289ee8c77b71eb8b41c123a163a9ae9
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count.html
>@@ -0,0 +1,61 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <title>CSSOM - Extensions to the Document Interface: StyleSheetList length reflects dynamically loaded and unloaded sheets</title>
>+    <link rel="author" title="Jesse Bounds" href="mailto:jesse@codeforamerica.org">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#extensions-to-the-document-interface">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-stylesheetlist-interface">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-style-sheet-collections">
>+    <link rel="stylesheet" href="stylesheet.css" type="text/css">
>+    <meta name="flags" content="dom">
>+    <meta name="assert" content="The styleSheets length attribute must reflect the number of sheets at page load and after dynamically">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+</head>
>+<body>
>+    <div id="log"></div>
>+    <script>
>+
>+      // Get the Document's styleSheets attribute
>+      var styleSheets = document.styleSheets;
>+
>+      // Verify that the styleSheets list length is 1 due to "stylesheet.css" loaded in head section
>+      test(function() {
>+        assert_equals(styleSheets.length, 1, "styleSheets.length is incorrect:");
>+      }, "stylesheet.css should be loaded and styleSheets.length === 1");
>+
>+      // Verify that the styleSheets list length is 0 after removing the loaded sheet from the DOM
>+      test(function() {
>+
>+        // get the one and only sheet loaded
>+        var sheet = styleSheets.item(0);
>+
>+        // remove the sheet from the DOM
>+        sheet.ownerNode.parentNode.removeChild(sheet.ownerNode)
>+
>+        // assert that there are 0 styleSheets in the styleSheets property
>+        assert_equals(styleSheets.length, 0, "styleSheets.length is incorrect:");
>+
>+      }, "stylesheet.css should be unloaded and styleSheets.length === 0");
>+
>+      // Verify that the styleSheets list length is back to 1 after loading a new sheet
>+      test(function() {
>+
>+        // create a css file reference
>+        var fileReference = document.createElement("link");
>+        fileReference.setAttribute("rel", "stylesheet");
>+        fileReference.setAttribute("type", "text/css");
>+        fileReference.setAttribute("href", "stylesheet-1.css");
>+
>+        // load the css file reference into the head section
>+        var head = document.getElementsByTagName("HEAD")[0];
>+        head.appendChild(fileReference);
>+
>+        // assert that there is 1 styleSheet in the styleSheets property
>+        assert_equals(styleSheets.length, 1, "styleSheets.length is incorrect:");
>+
>+      }, "stylesheet-1.css should be loaded and styleSheets.length === 1");
>+
>+    </script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..80391760c1bc8907fb2dc99905193eccc4806d2c
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order-expected.txt
>@@ -0,0 +1,8 @@
>+
>+FAIL styleSheets.length must be 5 assert_equals: styleSheets.length is incorrect: expected 5 but got 1
>+PASS styleSheets item 0 title must be aaa 
>+FAIL styleSheets item 1 title must be zebra null is not an object (evaluating 'styleSheets.item(1).title')
>+FAIL styleSheets item 0 title must be kilo null is not an object (evaluating 'styleSheets.item(2).title')
>+FAIL styleSheets item 0 title must be alpha null is not an object (evaluating 'styleSheets.item(3).title')
>+FAIL styleSheets item 0 title must be zebra null is not an object (evaluating 'styleSheets.item(4).title')
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..8ea75099b83f325fe8ebe0c27f65dafa3696fe5a
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order.html
>@@ -0,0 +1,56 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <title>CSSOM -  Extensions to the Document Interface: Stylesheet header load order</title>
>+    <link rel="author" title="Jesse Bounds" href="mailto:jesse@codeforamerica.org">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#extensions-to-the-document-interface">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-stylesheetlist-interface">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-style-sheet-collections">
>+    <style title="aaa" type="text/css">
>+      H1 {border-width: 1; border: solid; text-align: center}
>+    </style>
>+    <link title="zebra" rel="stylesheet" href="zebra.css" type="text/css">
>+    <link title="kilo" rel="stylesheet" href="kilo.css"  type="text/css">
>+    <link title="alpha" rel="stylesheet" href="alpha.css" type="text/css">
>+    <link title="zebra" rel="stylesheet" href="/directory01/zebra.css" type="text/css">
>+    <meta name="flags" content="dom">
>+    <meta name="assert" content="Document's style sheets created from HTTP Link headers are first in list and loaded in header order">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+</head>
>+<body>
>+    <div id="log"></div>
>+    <script>
>+
>+      // Get the Document's styleSheets attribute
>+      var styleSheets = document.styleSheets;
>+
>+      // Verify that the styleSheets list length is 5
>+      test(function() {
>+        assert_equals(styleSheets.length, 5, "styleSheets.length is incorrect:");
>+      }, "styleSheets.length must be 5");
>+
>+      // Verify that titles of loaded sheets are as expected (in the correct order)
>+      test(function() {
>+        assert_equals(styleSheets.item(0).title, "aaa", "title for item 1 is incorrect:");
>+      }, "styleSheets item 0 title must be aaa");
>+      // Verify that titles of loaded sheets are as expected (in the correct order)
>+      test(function() {
>+        assert_equals(styleSheets.item(1).title, "zebra", "title for item 1 is incorrect:");
>+      }, "styleSheets item 1 title must be zebra");
>+      // Verify that titles of loaded sheets are as expected (in the correct order)
>+      test(function() {
>+        assert_equals(styleSheets.item(2).title, "kilo", "title for item 1 is incorrect:");
>+      }, "styleSheets item 0 title must be kilo");
>+      // Verify that titles of loaded sheets are as expected (in the correct order)
>+      test(function() {
>+        assert_equals(styleSheets.item(3).title, "alpha", "title for item 1 is incorrect:");
>+      }, "styleSheets item 0 title must be alpha");
>+      // Verify that titles of loaded sheets are as expected (in the correct order)
>+      test(function() {
>+        assert_equals(styleSheets.item(4).title, "zebra", "title for item 1 is incorrect:");
>+      }, "styleSheets item 0 title must be zebra");
>+
>+    </script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-document-extension-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-document-extension-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..ee4857c4bfd7c2996783e789c1cb3bdda5812820
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-document-extension-expected.txt
>@@ -0,0 +1,3 @@
>+
>+PASS CSSOM - Extensions to the Document Interface: StyleSheetList length is 0 when no sheets loaded 
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-document-extension.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-document-extension.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..33260ac5070505d0e52c8ef04bcdbe96cbd3f040
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-document-extension.html
>@@ -0,0 +1,25 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <title>CSSOM - Extensions to the Document Interface: StyleSheetList length is 0 when no sheets loaded</title>
>+    <link rel="author" title="Jesse Bounds" href="mailto:jesse@codeforamerica.org">
>+    <link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> 
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#extensions-to-the-document-interface">
>+    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-stylesheetlist-interface">
>+    <meta name="flags" content="dom">
>+    <meta name="assert" content="The styleSheets attribute must return a StyleSheetList sequence representing the document style sheets.">
>+    <script src="../../../../../resources/testharness.js"></script>
>+    <script src="../../../../../resources/testharnessreport.js"></script>
>+</head>
>+<body>
>+    <div id="log"></div>
>+    <script>
>+        // Get the Document's styleSheets attribute
>+        var styleSheets = document.styleSheets;
>+        // Verify that the styleSheets list length is 0 because no stylesheets have been loaded
>+        test(function() {
>+          assert_equals(styleSheets.length, 0, "styleSheets.length is incorrect:");
>+        })
>+    </script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/variable-names-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/variable-names-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..5bfc003c47fe7f1ab2fe89484b007480e34211d7
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/variable-names-expected.txt
>@@ -0,0 +1,8 @@
>+
>+FAIL custom property '--a' assert_equals: property value returned correctly from specified style getPropertyValue (after serialization/re-parsing) expected "value" but got " value"
>+FAIL custom property '--a;b' assert_equals: appears on specified style (after serialization/re-parsing) expected 1 but got 0
>+FAIL custom property '---' assert_equals: property value returned correctly from specified style getPropertyValue (after serialization/re-parsing) expected "value" but got " value"
>+FAIL custom property '--\' assert_equals: appears on specified style (after serialization/re-parsing) expected 1 but got 0
>+FAIL custom property '--ab' assert_equals: property value returned correctly from specified style getPropertyValue (after serialization/re-parsing) expected "value" but got " value"
>+FAIL custom property '--0' assert_equals: property value returned correctly from specified style getPropertyValue (after serialization/re-parsing) expected "value" but got " value"
>+
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/variable-names.html b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/variable-names.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..50f60ea322dea1dd8023ddb14c44af6ac0fef50b
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/variable-names.html
>@@ -0,0 +1,48 @@
>+<!DOCTYPE html>
>+<meta charset="utf-8">
>+<title>Tests for handling of CSS Custom Property names</title>
>+<link rel="help" href="https://drafts.csswg.org/css-variables/#serializing-custom-props">
>+<meta name="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
>+<script src="../../../../../resources/testharness.js"></script>
>+<script src="../../../../../resources/testharnessreport.js"></script>
>+<div id="log"></div>
>+<script>
>+
>+// Valid custom property names, before and after CSS escaping.
>+var valid_names = [
>+  ["--a", "--a"],
>+  ["--a;b", "--a\\;b"],
>+  ["---", "---"],
>+  ["--\\", "--\\\\"],
>+  ["--ab", "--\\61 b"],
>+  ["--0", "--\\30 "],
>+];
>+
>+valid_names.forEach(function(t) {
>+  var name = t[0];
>+  var escaped_name = t[1];
>+
>+  test(function() {
>+    var e = document.createElement("span");
>+    e.style = escaped_name + ":value";
>+
>+    for (var after_refeeding = 0; after_refeeding <= 1; ++after_refeeding) {
>+      var desc_suffix = (after_refeeding ? " (after " : " (before ") +
>+                        "serialization/re-parsing)";
>+
>+      assert_equals(e.style.length, 1,
>+                    "appears on specified style" + desc_suffix);
>+
>+      assert_equals(e.style[0], name,
>+                    "name returned correctly from specified " +
>+                    "style indexed getter" + desc_suffix);
>+
>+      assert_equals(e.style.getPropertyValue(name), "value",
>+                    "property value returned correctly from " +
>+                    "specified style getPropertyValue" + desc_suffix);
>+
>+      e.style = e.style.cssText;
>+    }
>+  }, "custom property '" + name + "'");
>+});
>+</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/w3c-import.log b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/w3c-import.log
>new file mode 100644
>index 0000000000000000000000000000000000000000..8997dcfd2a2abb1fb5cb982b41ac5fe282e3623e
>--- /dev/null
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/w3c-import.log
>@@ -0,0 +1,97 @@
>+The tests in this directory were imported from the W3C repository.
>+Do NOT modify these tests directly in WebKit.
>+Instead, create a pull request on the WPT github:
>+	https://github.com/w3c/web-platform-tests
>+
>+Then run the Tools/Scripts/import-w3c-tests in WebKit to reimport
>+
>+Do NOT modify or remove this file.
>+
>+------------------------------------------------------------------------
>+Properties requiring vendor prefixes:
>+None
>+Property values requiring vendor prefixes:
>+None
>+------------------------------------------------------------------------
>+List of files:
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSS.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframeRule.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSKeyframesRule.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSNamespaceRule.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSRuleList.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText-namespace.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule-set-selectorText.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleRule.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/CSSStyleSheet.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/MediaList2.xhtml
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/OWNERS
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/StyleSheetList.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-001.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-002.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-003.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/computed-style-004.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attr-decl-block.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-attribute-modifications.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-declaration-modifications.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/css-style-reparse.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssimportrule.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssText-serialize.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-cssstyledeclaration-set.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule-constructors.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-fontfacerule.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-ruleTypeAndOrder.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssom-setProperty-shorthand.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-final-delimiter.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-important.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutability.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-001.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-002.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-003.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-mutationrecord-004.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-setter-order.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/escape.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/font-shorthand-serialization.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-detached-subtree.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-dynamic-subdoc.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/getComputedStyle-pseudo.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/historical.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/inline-style-001.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-charset-no-index.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-import-no-index.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-namespace-no-index.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-no-index.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/insertRule-syntax-error-01.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/interfaces.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-dynamic-001-expected.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-dynamic-001.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-001.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-002.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-003.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/medialist-interfaces-004.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/overflow-serialization.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-order.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/preferred-stylesheet-reversed-order.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorSerialize.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-001-expected.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-001.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/selectorText-modification-restyle-002.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialization-CSSDeclaration-with-important.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-namespaced-type-selectors.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-values.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/serialize-variable-reference.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/setproperty-null-undefined.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-serialization.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/shorthand-values.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-001.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/style-sheet-interfaces-002.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-replacedata-dynamic-expected.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-replacedata-dynamic.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-same-origin.css
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-same-origin.sub.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/stylesheet-title.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/ttwf-cssom-document-extension.html
>+/LayoutTests/imported/w3c/web-platform-tests/css/cssom/variable-names.html
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSS-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSS-expected.txt
>deleted file mode 100644
>index 3bafa7b190130e6f54b820f3078bd06e8f135f7a..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSS-expected.txt
>+++ /dev/null
>@@ -1,5 +0,0 @@
>-
>-PASS CSS.escape 
>-PASS CSS.supports, one argument form 
>-FAIL CSS.supports, two argument form assert_equals: CSS.supports: two argument form succeeds for custom property expected true but got false
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSS.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSS.html
>deleted file mode 100644
>index 1bbecbfa3ba4e323c8307c5b06a5cbca2472f450..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSS.html
>+++ /dev/null
>@@ -1,37 +0,0 @@
>-<!doctype html>
>-<meta charset="utf-8">
>-<title>CSSOM - CSS interface</title>
>-<script src="/resources/testharness.js"></script>
>-<script src="/resources/testharnessreport.js"></script>
>-<script>
>-    test(function () {
>-        // https://drafts.csswg.org/cssom/#dom-css-escape
>-        // https://drafts.csswg.org/cssom/#serialize-an-identifier
>-        assert_equals(CSS.escape("hello world"), "hello\\ world", "CSS.escape: spaces get escaped with backslashes");
>-        assert_equals(CSS.escape("hello\0world"), "hello\u{FFFD}world", "CSS.escape: NULL get replaced with U+FFFD REPLACEMENT CHARACTER");
>-        assert_equals(CSS.escape("hello0world"), "hello0world", "CSS.escape: Numbers within string preserved");
>-        assert_equals(CSS.escape("hello\x10world"), "hello\\10 world", "CSS.escape: Values between \\x01 and \\x1f are unicode escaped");
>-        assert_equals(CSS.escape("hello\\world"), "hello\\\\world", "CSS.escape: Backslashes get backslash-escaped");
>-        assert_equals(CSS.escape("hello\u{1234}world"), "hello\u{1234}world", "CSS.escape: Code points greater than U+0080 are preserved");
>-        assert_equals(CSS.escape("hello\x7Fworld"), "hello\\7f world", "CSS.escape: Some code points less than U+0080 are unicode-escaped");
>-        assert_equals(CSS.escape("-"), "\\-", "CSS.escape: Single dash escaped");
>-        assert_equals(CSS.escape("0foo"), "\\30 foo", "CSS.escape: Numbers at the beginning of an ident get unicode escaped");
>-        assert_equals(CSS.escape("-0foo"), "-\\30 foo", "CSS.escape: Numbers at the beginning of an ident after single hyphen get unicode escaped");
>-        assert_equals(CSS.escape("--0foo"), "--0foo", "CSS.escape: Numbers at the beginning of an ident after multiple hyphens do not get unicode escaped");
>-    }, "CSS.escape");
>-    test(function () {
>-        // https://drafts.csswg.org/css-conditional/#dom-css-supports
>-        // https://drafts.csswg.org/css-conditional/#typedef-supports-condition
>-        assert_equals(CSS.supports("color: red"), true, "CSS.supports: Single-argument form allows for declarations without enclosing parentheses");
>-        assert_equals(CSS.supports("(color: red) and (color: blue)"), true, "CSS.supports: Complex conditions allowed");
>-        assert_equals(CSS.supports("not (foobar)"), true, "CSS.supports: general_enclosed still parses");
>-    }, "CSS.supports, one argument form");
>-    test(function () {
>-        // https://drafts.csswg.org/css-conditional/#dom-css-supports
>-        // https://drafts.csswg.org/css-conditional/#dfn-support
>-        assert_equals(CSS.supports("color", "red"), true, "CSS.supports: two argument form succeeds for known property");
>-        assert_equals(CSS.supports("unknownproperty", "blah"), false, "CSS.supports: two argument form fails for unknown property");
>-        assert_equals(CSS.supports("width", "blah"), false, "CSS.supports: two argument form fails for invalid value");
>-        assert_equals(CSS.supports("--foo", "blah"), true, "CSS.supports: two argument form succeeds for custom property");
>-    }, "CSS.supports, two argument form");
>-</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframeRule-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframeRule-expected.txt
>deleted file mode 100644
>index cbeab2be49c6ce70e5e15f342959d9bd6b009dce..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframeRule-expected.txt
>+++ /dev/null
>@@ -1,4 +0,0 @@
>-
>-PASS CSSKeyframeRule: style property 
>-PASS CSSKeyframeRule: style property has [PutForwards] 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframeRule.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframeRule.html
>deleted file mode 100644
>index 532aa6fa91086805971e25d6d4a9c2f55ac75af6..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframeRule.html
>+++ /dev/null
>@@ -1,51 +0,0 @@
>-<!doctype html>
>-<meta charset="utf-8">
>-<title></title>
>-<script src="/resources/testharness.js"></script>
>-<script src="/resources/testharnessreport.js"></script>
>-<style type="text/css" id="styleElement">
>-  div { animation: 3s slidein; }
>-  @keyframes slidein {
>-    from {
>-      margin-left: 100%;
>-      width: 300%;
>-    }
>-
>-    to {
>-      margin-left: 0%;
>-      width: 100%;
>-    }
>-  }
>-</style>
>-<script>
>-  var styleSheet = document.getElementById("styleElement").sheet;
>-  var keyframesRule = styleSheet.cssRules[1];
>-  var fromRule = keyframesRule.cssRules[0];
>-  var toRule = keyframesRule.cssRules[1];
>-
>-  test(function() {
>-    assert_equals(keyframesRule.name, "slidein");
>-    assert_equals(typeof fromRule.style, "object");
>-    assert_equals(fromRule.style.marginLeft, "100%");
>-    assert_equals(fromRule.style.width, "300%");
>-
>-    assert_equals(typeof toRule.style, "object");
>-    assert_equals(toRule.style.marginLeft, "0%");
>-    assert_equals(toRule.style.width, "100%");
>-
>-    toRule.style.marginLeft = "-5%";
>-    toRule.style.width = "50%";
>-
>-    assert_equals(fromRule.style.marginLeft, "100%");
>-    assert_equals(fromRule.style.width, "300%");
>-    assert_equals(toRule.style.marginLeft, "-5%");
>-    assert_equals(toRule.style.width, "50%");
>-  }, "CSSKeyframeRule: style property");
>-
>-  test(function() {
>-    fromRule.style = "margin-left: 50%; width: 100%;";
>-
>-    assert_equals(fromRule.style.marginLeft, "50%", "margin-left");
>-    assert_equals(fromRule.style.width, "100%", "width");
>-  }, "CSSKeyframeRule: style property has [PutForwards]");
>-</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframesRule-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframesRule-expected.txt
>deleted file mode 100644
>index 7f1e99ed4557574a5cfc200f6021fdbdc8d33d8a..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframesRule-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-FAIL CSSOM -  CSSKeyframesRule interface assert_equals: CSSKeyframesRule cssText attribute expected "@keyframesbar{}" but got "@-webkit-keyframesbar{}"
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframesRule.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframesRule.html
>deleted file mode 100644
>index 68453498767ca78073b22204fde0d8720298d90c..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframesRule.html
>+++ /dev/null
>@@ -1,73 +0,0 @@
>-<!doctype html>
>-<html>
>-<head>
>-    <meta charset="utf-8">
>-    <title>CSSOM -  CSSKeyframesRule interface</title>
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-    <style>
>-        @keyframes foo {
>-            0% { top: 0px; }
>-            100% { top: 200px; }
>-        }
>-        @keyframes empty {}
>-    </style>
>-
>-    <script>
>-    test(function () {
>-        var keyframe = document.styleSheets[0].cssRules[0];
>-        assert_equals(keyframe.name, "foo", "CSSKeyframesRule name attribute");
>-        assert_equals(keyframe.cssRules.length, 2, "CSSKeyframesRule cssRule length attribute");
>-        assert_equals(keyframe.cssRules[0].cssText, "0% { top: 0px; }", "CSSKeyframesRule cssRule cssText attribute");
>-        assert_equals(keyframe.cssRules[1].cssText, "100% { top: 200px; }", "CSSKeyframesRule cssRule cssText attribute");
>-
>-        keyframe.appendRule("50% { top: 100px; }");
>-        assert_equals(keyframe.cssRules.length, 3, "CSSKeyframesRule cssRule length attribute after appendRule function");
>-        assert_equals(keyframe.cssRules[0].cssText, "0% { top: 0px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>-        assert_equals(keyframe.cssRules[1].cssText, "100% { top: 200px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>-        assert_equals(keyframe.cssRules[2].cssText, "50% { top: 100px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>-
>-        keyframe.appendRule("0% { top: 50px; }");
>-        assert_equals(keyframe.cssRules.length, 4, "CSSKeyframesRule cssRule length attribute after appendRule function");
>-        assert_equals(keyframe.cssRules[0].cssText, "0% { top: 0px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>-        assert_equals(keyframe.cssRules[1].cssText, "100% { top: 200px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>-        assert_equals(keyframe.cssRules[2].cssText, "50% { top: 100px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>-        assert_equals(keyframe.cssRules[3].cssText, "0% { top: 50px; }", "CSSKeyframesRule cssRule cssText attribute after appendRule function");
>-
>-        var find1 = keyframe.findRule("50%");
>-        assert_equals(find1.cssText, "50% { top: 100px; }", "CSSKeyframesRule findRule function");
>-        var find2 = keyframe.findRule("0%");
>-        assert_equals(find2.cssText, "0% { top: 50px; }", "CSSKeyframesRule findRule function");
>-        var find3 = keyframe.findRule("70%");
>-        assert_equals(find3, null, "CSSKeyframesRule findRule function");
>-
>-        keyframe.deleteRule("100%");
>-        assert_equals(keyframe.cssRules.length, 3, "CSSKeyframesRule cssRule length attribute after deleteRule function");
>-        assert_equals(keyframe.cssRules[0].cssText, "0% { top: 0px; }", "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>-        assert_equals(keyframe.cssRules[1].cssText, "50% { top: 100px; }", "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>-        assert_equals(keyframe.cssRules[2].cssText, "0% { top: 50px; }", "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>-        assert_equals(keyframe.cssRules[3], undefined, "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>-
>-        keyframe.deleteRule("80%");
>-        assert_equals(keyframe.cssRules.length, 3, "CSSKeyframesRule cssRule length attribute after deleteRule function");
>-        assert_equals(keyframe.cssRules[0].cssText, "0% { top: 0px; }", "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>-        assert_equals(keyframe.cssRules[1].cssText, "50% { top: 100px; }", "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>-        assert_equals(keyframe.cssRules[2].cssText, "0% { top: 50px; }", "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>-        assert_equals(keyframe.cssRules[3], undefined, "CSSKeyframesRule cssRule cssText attribute after deleteRule function");
>-
>-        var empty = document.styleSheets[0].cssRules[1];
>-        empty.name = "bar";
>-        assert_equals(empty.name, "bar", "CSSKeyframesRule name setter");
>-        assert_equals(empty.cssText.replace(/\s/g, ""), "@keyframesbar{}", "CSSKeyframesRule cssText attribute");
>-
>-        empty.name = "initial";
>-        assert_equals(empty.name, "initial", "CSSKeyframesRule name setter, CSS-wide keyword");
>-        assert_equals(empty.cssText.replace(/\s/g, ""), "@keyframes\"initial\"{}", "CSSKeyframesRule cssText attribute with CSS-wide keyword name");
>-
>-        empty.name = "none";
>-        assert_equals(empty.name, "none", "CSSKeyframesRule name setter, 'none'");
>-        assert_equals(empty.cssText.replace(/\s/g, ""), "@keyframes\"none\"{}", "CSSKeyframesRule cssText attribute with 'none' name");
>-    });
>-    </script>
>-</head>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSNamespaceRule-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSNamespaceRule-expected.txt
>deleted file mode 100644
>index 2b892a2e4492375ef77f9e366e4fe80f451a9929..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSNamespaceRule-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-PASS CSSOM - CSSNamespaceRule interface 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSNamespaceRule.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSNamespaceRule.html
>deleted file mode 100644
>index 64ed94b6e7f9e8d125f9ba4a39c63fefee4102bb..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSNamespaceRule.html
>+++ /dev/null
>@@ -1,31 +0,0 @@
>-<!doctype html>
>-<html>
>-<head>
>-    <meta charset="utf-8">
>-    <title>CSSOM - CSSNamespaceRule interface</title>
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-    <style>
>-        @namespace svg url(http://servo);
>-        @namespace url(http://servo1);
>-        @namespace svg url("http://servo2");
>-    </style>
>-
>-    <script>
>-    test(function () {
>-        var rules = document.styleSheets[0].cssRules;
>-        assert_equals(rules[0].prefix, "svg", "CSSNamespaceRule prefix attribute");
>-        assert_equals(rules[0].namespaceURI, "http://servo", "CSSNamespaceRule namespaceURI attribute");
>-        assert_equals(rules[0].cssText, "@namespace svg url(\"http://servo\");", "CSSNamespaceRule cssText attribute");
>-
>-        assert_equals(rules[1].prefix, "", "CSSNamespaceRule prefix attribute");
>-        assert_equals(rules[1].namespaceURI, "http://servo1", "CSSNamespaceRule namespaceURI attribute");
>-        assert_equals(rules[1].cssText, "@namespace url(\"http://servo1\");", "CSSNamespaceRule cssText attribute");
>-
>-        assert_equals(rules[2].prefix, "svg", "CSSNamespaceRule prefix attribute");
>-        assert_equals(rules[2].namespaceURI, "http://servo2", "CSSNamespaceRule namespaceURI attribute");
>-        assert_equals(rules[2].cssText, "@namespace svg url(\"http://servo2\");", "CSSNamespaceRule cssText attribute");
>-    });
>-    </script>
>-</head>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSRuleList-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSRuleList-expected.txt
>deleted file mode 100644
>index 0709a8c09d146be4108dcc77e2b7e39d92cdb0b3..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSRuleList-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-PASS CSSOM - CSSRuleList interface 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSRuleList.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSRuleList.html
>deleted file mode 100644
>index a394779617dd68c6982934fc1242edb3cf8c5e1f..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSRuleList.html
>+++ /dev/null
>@@ -1,26 +0,0 @@
>-<!doctype html>
>-<html>
>-<head>
>-    <meta charset="utf-8">
>-    <title>CSSOM - CSSRuleList interface</title>
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-    <style>
>-        body { width: 50%; }
>-        #foo { height: 100px; }
>-    </style>
>-
>-    <script>
>-    test(function () {
>-        var ruleList = document.styleSheets[0].cssRules;
>-        assert_equals(ruleList.length, 2, "CSSRuleList length attribute");
>-        assert_equals(ruleList[0].cssText, "body { width: 50%; }", "CSSRuleList indexed getter");
>-        assert_equals(ruleList[1].cssText, "#foo { height: 100px; }", "CSSRuleList indexed getter");
>-        assert_equals(ruleList[2], undefined, "CSSRuleList indexed getter");
>-        assert_equals(ruleList.item(0).cssText, "body { width: 50%; }", "CSSRuleList item function");
>-        assert_equals(ruleList.item(1).cssText, "#foo { height: 100px; }", "CSSRuleList item function");
>-        assert_equals(ruleList.item(2), null, "CSSRuleList item function");
>-    });
>-    </script>
>-</head>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleRule-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleRule-expected.txt
>deleted file mode 100644
>index 3cb92f443a5b1e49ad6a4f11e009c2a78bc08ed0..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleRule-expected.txt
>+++ /dev/null
>@@ -1,12 +0,0 @@
>-
>-PASS CSSRule and CSSStyleRule types 
>-PASS Type of CSSRule#type and constant values 
>-PASS Existence of CSSRule attributes 
>-PASS Writability of CSSRule attributes 
>-PASS Values of CSSRule attributes 
>-PASS Existence and type of CSSStyleRule attributes 
>-PASS Assigning to CSSStyleRule.style assigns to cssText; CSSStyleRule.style returns the same object 
>-PASS Values of CSSStyleRule attributes 
>-PASS Mutability of CSSStyleRule's style attribute 
>-PASS CSSStyleRule's style has [PutForwards] 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleRule.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleRule.html
>deleted file mode 100644
>index 3acdfb12852356ac28e91af25c82052d45864b0e..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleRule.html
>+++ /dev/null
>@@ -1,113 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-<head>
>-    <title>CSSOM CSSRule CSSStyleRule interface</title>
>-    <link rel="author" title="Letitia Lew" href="mailto:lew.letitia@gmail.com">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-rules">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstylerule-interface">
>-    <meta name="flags" content="dom">
>-    <meta name="assert" content="All properties for this CSSStyleRule instance of CSSRule are initialized correctly">
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-
>-    <style id="styleElement" type="text/css">
>-        div { margin: 10px; padding: 0px; }
>-    </style>
>-</head>
>-<body>
>-    <div id="log"></div>
>-
>-    <script type="text/javascript">
>-        var rule;
>-        setup(function() {
>-            var styleSheet = document.getElementById("styleElement").sheet;
>-            var ruleList = styleSheet.cssRules;
>-            rule = ruleList[0];
>-        });
>-
>-        test(function() {
>-            assert_true(rule instanceof CSSRule);
>-            assert_true(rule instanceof CSSStyleRule);
>-        }, "CSSRule and CSSStyleRule types");
>-
>-        test(function() {
>-            assert_equals(rule.STYLE_RULE, 1);
>-            assert_equals(rule.IMPORT_RULE, 3);
>-            assert_equals(rule.MEDIA_RULE, 4);
>-            assert_equals(rule.FONT_FACE_RULE, 5);
>-            assert_equals(rule.PAGE_RULE, 6);
>-            assert_equals(rule.NAMESPACE_RULE, 10);
>-            assert_idl_attribute(rule, "type");
>-            assert_equals(typeof rule.type, "number");
>-        }, "Type of CSSRule#type and constant values");
>-
>-        test(function() {
>-            assert_true(rule instanceof CSSRule);
>-            assert_idl_attribute(rule, "cssText");
>-            assert_idl_attribute(rule, "parentRule");
>-            assert_idl_attribute(rule, "parentStyleSheet");
>-        }, "Existence of CSSRule attributes");
>-
>-        test(function() {
>-            assert_readonly(rule, "type");
>-            assert_readonly(rule, "parentRule");
>-            assert_readonly(rule, "parentStyleSheet");
>-        }, "Writability of CSSRule attributes");
>-
>-        test(function() {
>-            assert_equals(rule.type, rule.STYLE_RULE);
>-            assert_equals(typeof rule.cssText, "string");
>-            assert_equals(rule.cssText, "div { margin: 10px; padding: 0px; }");
>-            assert_equals(rule.parentRule, null);
>-            assert_true(rule.parentStyleSheet instanceof CSSStyleSheet);
>-        }, "Values of CSSRule attributes");
>-
>-        test(function() {
>-            assert_idl_attribute(rule, "selectorText");
>-            assert_equals(typeof rule.selectorText, "string");
>-            assert_idl_attribute(rule, "style");
>-        }, "Existence and type of CSSStyleRule attributes");
>-
>-        test(function() {
>-            // CSSStyleRule.style has PutForwards=cssText and SameObject.
>-            var initial = rule.style.cssText;
>-            var style = rule.style;
>-
>-            rule.style = "";
>-            assert_equals(rule.style.cssText, "");
>-            assert_equals(rule.style, style);
>-
>-            rule.style = "margin: 42px;";
>-            assert_equals(rule.style.margin, "42px");
>-            assert_equals(rule.style, style);
>-
>-            rule.style = initial;
>-            assert_equals(rule.style, style);
>-        }, "Assigning to CSSStyleRule.style assigns to cssText; CSSStyleRule.style returns the same object");
>-
>-        test(function() {
>-            assert_equals(rule.selectorText, "div");
>-            assert_true(rule.style instanceof CSSStyleDeclaration);
>-        }, "Values of CSSStyleRule attributes");
>-
>-        test(function() {
>-            assert_equals(rule.style.margin, "10px");
>-            assert_equals(rule.style.padding, "0px");
>-
>-            rule.style.padding = "5px";
>-            rule.style.border = "1px solid";
>-
>-            assert_equals(rule.style.padding, "5px");
>-            assert_equals(rule.style.border, "1px solid");
>-        }, "Mutability of CSSStyleRule's style attribute");
>-
>-        test(function() {
>-            rule.style = "margin: 15px; padding: 2px;";
>-
>-            assert_equals(rule.style.margin, "15px", "margin");
>-            assert_equals(rule.style.padding, "2px", "padding");
>-        }, "CSSStyleRule's style has [PutForwards]");
>-    </script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleSheet-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleSheet-expected.txt
>deleted file mode 100644
>index 58f3208da61ba697e28c20a7d8846a7d08ce2b38..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleSheet-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-PASS CSSOM - CSSStyleSheet interface 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleSheet.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleSheet.html
>deleted file mode 100644
>index 62ad133d5f60ab12ad85182091d45e2a88d3e63a..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleSheet.html
>+++ /dev/null
>@@ -1,43 +0,0 @@
>-<!doctype html>
>-<html>
>-<head>
>-    <meta charset="utf-8">
>-    <title>CSSOM - CSSStyleSheet interface</title>
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-    <style id="my-stylesheet">
>-        body { width: 50%; }
>-        #foo { height: 100px; }
>-    </style>
>-
>-    <script>
>-    test(function () {
>-        var styleSheet = document.styleSheets[0];
>-        styleSheet.cssRules[0].randomProperty = 1;
>-        styleSheet.cssRules[1].randomProperty = 2;
>-
>-        assert_equals(styleSheet, document.getElementById("my-stylesheet").sheet, "CSSStyleSheet and LinkStyle's sheet attribute");
>-        assert_equals(styleSheet.cssRules.length, 2, "CSSStyleSheet cssRules attribute");
>-        assert_equals(styleSheet.cssRules[0].cssText, "body { width: 50%; }", "CSSStyleSheet cssRules attribute");
>-        assert_equals(styleSheet.cssRules[1].cssText, "#foo { height: 100px; }", "CSSStyleSheet cssRules attribute");
>-        assert_equals(styleSheet.cssRules[2], undefined, "CSSStyleSheet cssRules attribute");
>-
>-        styleSheet.insertRule("#bar { margin: 10px; }", 1);
>-        assert_equals(styleSheet.cssRules.length, 3, "CSSStyleSheet cssRules attribute after insertRule function");
>-        assert_equals(styleSheet.cssRules[0].cssText, "body { width: 50%; }", "CSSStyleSheet cssRules attribute");
>-        assert_equals(styleSheet.cssRules[1].cssText, "#bar { margin: 10px; }", "CSSStyleSheet cssRules attribute after insertRule function");
>-        assert_equals(styleSheet.cssRules[2].cssText, "#foo { height: 100px; }", "CSSStyleSheet cssRules attribute after insertRule function");
>-        assert_equals(styleSheet.cssRules[0].randomProperty, 1, "[SameObject] cssRules attribute after insertRule function");
>-        assert_equals(styleSheet.cssRules[2].randomProperty, 2, "[SameObject] cssRules attribute after insertRule function");
>-
>-        styleSheet.deleteRule(1);
>-        assert_equals(styleSheet.cssRules.length, 2, "CSSStyleSheet cssRules attribute after deleteRule function");
>-        assert_equals(styleSheet.cssRules[0].cssText, "body { width: 50%; }", "CSSStyleSheet cssRules attribute after deleteRule function");
>-        assert_equals(styleSheet.cssRules[1].cssText, "#foo { height: 100px; }", "CSSStyleSheet cssRules attribute after deleteRule function");
>-        assert_equals(styleSheet.cssRules[2], undefined, "CSSStyleSheet cssRules attribute after deleteRule function");
>-        assert_equals(styleSheet.cssRules[0].randomProperty, 1, "[SameObject] cssRules attribute after deleteRule function");
>-        assert_equals(styleSheet.cssRules[1].randomProperty, 2, "[SameObject] cssRules attribute after deleteRule function");
>-    });
>-    </script>
>-</head>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/GetBoundingRect-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/GetBoundingRect-expected.txt
>deleted file mode 100644
>index 035475afd6ee9652b50eed2ec5efdc97518aad7c..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/GetBoundingRect-expected.txt
>+++ /dev/null
>@@ -1,4 +0,0 @@
>-FOO
>-
>-PASS getBoundingClientRect 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/GetBoundingRect.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/GetBoundingRect.html
>deleted file mode 100644
>index 6ab5e4c9b3fdaea837ead09d95da5f1d9c4831f0..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/GetBoundingRect.html
>+++ /dev/null
>@@ -1,30 +0,0 @@
>-<!doctype html>
>-<html>
>-  <head>
>-    <meta charset="utf-8">
>-    <title>getBoundingClientRect</title>
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-
>-    <style>
>-      #foo {
>-        margin: 0px 0px 0px 5px;
>-        transform: translate(10px, 200px);
>-        position: fixed;
>-        left: 5px;
>-        background-color: red;
>-      }
>-    </style>
>-  </head>
>-  <body>
>-    <div id="foo">
>-      FOO
>-    </div>
>-    <script>
>-        test(function () {
>-            var foo = document.getElementById("foo").getBoundingClientRect();
>-            assert_equals(foo.left, 20);
>-        });
>-    </script>
>-  </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList-expected.txt
>deleted file mode 100644
>index 19c716db578706ca72d810c131590de2891a46b9..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-PASS CSSOM - MediaList interface 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList.html
>deleted file mode 100644
>index b39fb20478e6798ef723ea56fa6dee49d366fd59..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList.html
>+++ /dev/null
>@@ -1,43 +0,0 @@
>-<!doctype html>
>-<html>
>-<head>
>-    <meta charset="utf-8">
>-    <title>CSSOM - MediaList interface</title>
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-    <style>
>-        @media screen and (min-width: 480px), print, projection {}
>-    </style>
>-
>-    <script>
>-    test(function () {
>-        var media = document.styleSheets[0].cssRules[0].media;
>-        assert_equals(media.length, 3, "MediaList length attribute");
>-        assert_equals(media.mediaText, "screen and (min-width: 480px), print, projection", "MediaList mediaText attribute");
>-        assert_equals(media[0], "screen and (min-width: 480px)", "MediaList indexed getter");
>-        assert_equals(media[1], "print", "MediaList indexed getter");
>-        assert_equals(media[2], "projection", "MediaList indexed getter");
>-        assert_equals(media[3], undefined, "MediaList indexed getter with out of range");
>-        assert_equals(media.item(0), "screen and (min-width: 480px)", "MediaList item method");
>-        assert_equals(media.item(3), null, "MediaList item method");
>-
>-        media.deleteMedium("print");
>-        assert_equals(media.length, 2, "MediaList length attribute after delete method");
>-        assert_equals(media.mediaText, "screen and (min-width: 480px), projection", "MediaList mediaText attribute after delete method");
>-        assert_equals(media[1], "projection", "MediaList indexed getter after delete method");
>-        assert_equals(media[2], undefined, "MediaList indexed getter with out of range after delete method");
>-        assert_equals(media.item(1), "projection", "MediaList indexed getter after delete method");
>-        assert_equals(media.item(2), null, "MediaList item method after delete method");
>-
>-        media.appendMedium("speech");
>-        assert_equals(media.length, 3, "MediaList length attribute after append method");
>-        assert_equals(media.mediaText, "screen and (min-width: 480px), projection, speech", "MediaList mediaText attribute after append method");
>-        assert_equals(media[1], "projection", "MediaList indexed getter after append method");
>-        assert_equals(media[2], "speech", "MediaList indexed getter after append method");
>-        assert_equals(media[3], undefined, "MediaList indexed getter with out of range after append method");
>-        assert_equals(media.item(2), "speech", "MediaList item method after append method");
>-        assert_equals(media.item(3), null, "MediaList item method after append method");
>-    });
>-    </script>
>-</head>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList2-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList2-expected.txt
>deleted file mode 100644
>index 6b5d51d4bda56b6f5eb1c230d23dad5f5b11f27e..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList2-expected.txt
>+++ /dev/null
>@@ -1,7 +0,0 @@
>-
>-PASS MediaList 
>-PASS MediaList.mediaText 
>-PASS MediaList.length 
>-PASS MediaList getter 
>-PASS MediaList.item 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList2.xhtml b/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList2.xhtml
>deleted file mode 100644
>index fb1062cba87ab9684883fc2bffd46623c960b1de..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList2.xhtml
>+++ /dev/null
>@@ -1,54 +0,0 @@
>-<!DOCTYPE html>
>-<html xmlns="http://www.w3.org/1999/xhtml">
>-<head>
>-<title>CSS Test: the MediaList interface</title>
>-<link rel="author" title="Ms2ger" href="mailto:Ms2ger@gmail.com"/>
>-<link rel="help" href="http://www.w3.org/TR/cssom-1/#the-medialist-interface"/>
>-<link rel="help" href="http://dev.w3.org/2006/webapi/WebIDL/#getownproperty"/>
>-<style media="screen, print" id="test-style"></style>
>-<script src="/resources/testharness.js"/>
>-<script src="/resources/testharnessreport.js"/>
>-<script id="metadata_cache">/*
>-{
>-  "MediaList": {},
>-  "MediaList.mediaText": {},
>-  "MediaList.length": {},
>-  "MediaList getter": {},
>-  "MediaList.item": {}
>-}
>-*/</script>
>-</head>
>-<body>
>-<div id="log"/>
>-<script>
>-test(function() {
>-  var ss = document.styleSheets[0];
>-  assert_equals(ss.ownerNode.id, "test-style", "Got the wrong style element");
>-
>-  var media = ss.media;
>-  test(function() {
>-    // https://www.w3.org/Bugs/Public/show_bug.cgi?id=17526
>-    assert_equals(media.mediaText, "screen, print", "Serialization should be \"screen, print\"");
>-  }, "MediaList.mediaText");
>-
>-  test(function() {
>-    assert_equals(media.length, 2, "Got wrong number of media");
>-  }, "MediaList.length");
>-
>-  test(function() {
>-    assert_equals(media[-1], undefined, "media[-1] should return undefined");
>-    assert_equals(media[0], "screen", "media[0] should return \"screen\"");
>-    assert_equals(media[1], "print", "media[1] should return \"print\"");
>-    assert_equals(media[2], undefined, "media[2] should return undefined");
>-  }, "MediaList getter");
>-
>-  test(function() {
>-    assert_equals(media.item(-1), null, "media.item(-1) should return null");
>-    assert_equals(media.item(0), "screen", "media.item(0) should return \"screen\"");
>-    assert_equals(media.item(1), "print", "media.item(1) should return \"print\"");
>-    assert_equals(media.item(2), null, "media.item(2) should return null");
>-  }, "MediaList.item");
>-}, "MediaList");
>-</script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/OWNERS b/LayoutTests/imported/w3c/web-platform-tests/cssom/OWNERS
>deleted file mode 100644
>index 607f8e85cc2dbc4c4dc35eb9d2c21b5ee4da8882..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/OWNERS
>+++ /dev/null
>@@ -1,4 +0,0 @@
>-@dbaron
>-@plinss
>-@lilles
>-@therealglazou
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/StyleSheetList-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/StyleSheetList-expected.txt
>deleted file mode 100644
>index 5dcc47a8ea2e04c810d8ae3b4da9ffe79aeb106e..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/StyleSheetList-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-PASS CSSOM - StyleSheetList interface 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/StyleSheetList.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/StyleSheetList.html
>deleted file mode 100644
>index 358264009a4ae4c205cf0ab3d3ffcf5c7a447ffb..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/StyleSheetList.html
>+++ /dev/null
>@@ -1,33 +0,0 @@
>-<!doctype html>
>-<html>
>-<head>
>-    <meta charset="utf-8">
>-    <title>CSSOM - StyleSheetList interface</title>
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-    <style>
>-        body { width: 50%; }
>-    </style>
>-    <style>
>-        #foo { width: 10%; }
>-        #bar { height: 100px; }
>-    </style>
>-    <script>
>-    test(function () {
>-        var styleSheets = document.styleSheets;
>-        assert_equals(styleSheets.length, 2, "StyleSheetList length attribute");
>-        assert_equals(styleSheets[0].cssRules.length, 1, "StyleSheetList indexed getter length attribute");
>-        assert_equals(styleSheets[1].cssRules.length, 2, "StyleSheetList indexed getter length attribute");
>-        assert_equals(styleSheets[2], undefined, "StyleSheetList indexed getter length attribute");
>-        assert_equals(styleSheets.item(0).cssRules.length, 1, "StyleSheetList item function length attribute");
>-        assert_equals(styleSheets.item(1).cssRules.length, 2, "StyleSheetList item function length attribute");
>-        assert_equals(styleSheets.item(2), null, "StyleSheetList item function length attribute");
>-
>-        styleSheets[0].randomProperty = 1;
>-        var style = document.createElement("style");
>-        document.head.appendChild(style);
>-        assert_equals(styleSheets[0].randomProperty, 1, "[SameObject] StyleSheetList");
>-    });
>-    </script>
>-</head>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/computed-style-001-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/computed-style-001-expected.txt
>deleted file mode 100644
>index 354e7730e29d663ff98061a14a24ca8db321f8e7..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/computed-style-001-expected.txt
>+++ /dev/null
>@@ -1,6 +0,0 @@
>-
>-PASS read_only 
>-PASS property_values 
>-PASS inherited_property_values 
>-PASS relative_property_values 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/computed-style-001.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/computed-style-001.html
>deleted file mode 100644
>index 2cdfc9eb8b42a32efb10d38f637a07912d400c95..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/computed-style-001.html
>+++ /dev/null
>@@ -1,78 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>- <head>
>-  <title>CSS Test: getComputedStyle</title>
>-  <link rel="author" title="Bear Travis" href="mailto:betravis@adobe.com">
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#extensions-to-the-window-interface">
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#resolved-values">
>-  <meta name="flags" content="dom">
>-  <meta name="assert" content="getComputedStyle returns a readonly CSSStyleDeclaration with resolved values">
>-  <script src="/resources/testharness.js" type="text/javascript"></script>
>-  <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>-  <style>
>-    #outside {
>-        width: 200px;
>-        height: 200px;
>-    }
>-    #outside div {
>-        font-size: 100px;
>-    }
>-    #inside {
>-        width: 50%;
>-        height: 100px;
>-    }
>-  </style>
>-<script id="metadata_cache">/*
>-{
>-  "read_only": { "assert": "do not allow modifications to a computed CSSStyleDeclaration" },
>-  "property_values": { "assert": "Directly set properties are resolved" },
>-  "inherited_property_values": { "assert": "Inherited properties are resolved" },
>-  "relative_property_values": { "assert": "Relative properties are resolved" }
>-}
>-*/</script>
>- </head>
>- <body>
>- <noscript>Test not run - javascript required.</noscript>
>- <div id="log"></div>
>- <div id="outside"><div id="inside"></div></div>
>- <script type="text/javascript">
>-    var outer = document.getElementById("outside");
>-    var inner = document.getElementById("inside");
>-    var innerStyle;
>-
>-    test(function() {
>-        innerStyle = window.getComputedStyle(inner);
>-        assert_throws(  "NO_MODIFICATION_ALLOWED_ERR",
>-                        function() { innerStyle.cssText = "color: blue;"; },
>-                        "do not allow setting cssText on a readonly CSSStyleDeclaration");
>-        assert_throws(  "NO_MODIFICATION_ALLOWED_ERR",
>-                        function() { innerStyle.setProperty("color", "blue"); },
>-                        "do not allow calling setProperty on a readonly CSSStyleDeclaration");
>-        assert_throws(  "NO_MODIFICATION_ALLOWED_ERR",
>-                        function() { innerStyle.color = "blue"; },
>-                        "do not allow setting a property on a readonly CSSStyleDeclaration");
>-    }, "read_only", {
>-        assert: "do not allow modifications to a computed CSSStyleDeclaration"
>-    });
>-
>-    test(function() {
>-        assert_equals(innerStyle.getPropertyValue("height"), "100px");
>-    }, "property_values", {
>-        assert: "Directly set properties are resolved"
>-    });
>-
>-    test(function() {
>-        assert_equals(innerStyle.getPropertyValue("font-size"), "100px");
>-    }, "inherited_property_values", {
>-        assert: "Inherited properties are resolved"
>-    });
>-
>-    test(function() {
>-        assert_equals(innerStyle.getPropertyValue("width"), "100px");
>-    }, "relative_property_values", {
>-        assert: "Relative properties are resolved"
>-    });
>- </script>
>- </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-attribute-modifications-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-attribute-modifications-expected.txt
>deleted file mode 100644
>index fb8cfc3aa4285ea95ecde47950baacacdedc0f6c..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-attribute-modifications-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-PASS Mutating the style declaration doesn't remove the style attribute 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-attribute-modifications.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-attribute-modifications.html
>deleted file mode 100644
>index 6177c336d76ea8433f619a0a4b62b55c816c1d3a..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-attribute-modifications.html
>+++ /dev/null
>@@ -1,13 +0,0 @@
>-<!DOCTYPE html>
>-<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:ecobos@igalia.com">
>-<link rel="help" href="https://drafts.csswg.org/cssom/#the-elementcssinlinestyle-interface">
>-<script src="/resources/testharness.js"></script>
>-<script src="/resources/testharnessreport.js"></script>
>-<div id="test" style="color: red"></div>
>-<script>
>-test(function() {
>-  var el = document.getElementById("test");
>-  el.style.color = "";
>-  assert_true(el.hasAttribute("style"));
>-}, "Mutating the style declaration doesn't remove the style attribute");
>-</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-declaration-modifications-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-declaration-modifications-expected.txt
>deleted file mode 100644
>index 096aa6e7e68ad172766e959e4746f6d9a1d7e73a..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-declaration-modifications-expected.txt
>+++ /dev/null
>@@ -1,5 +0,0 @@
>-
>-PASS Reading CSSStyleDeclaration initialized from a style element 
>-PASS Setting CSSStyleDeclaration#cssText 
>-PASS Calling CSSStyleDeclaration#setProperty 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-declaration-modifications.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-declaration-modifications.html
>deleted file mode 100644
>index 4db637d7de9edfa0b037fe434067a199784d36b8..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-declaration-modifications.html
>+++ /dev/null
>@@ -1,63 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>- <head>
>-  <title>CSS Test: CSSStyleDeclaration Interface</title>
>-  <link rel="author" title="Bear Travis" href="mailto:betravis@adobe.com">
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
>-  <meta name="flags" content="dom">
>-  <meta name="assert" content="CSSStyleDeclaration is properly initialized and can be modified through its interface">
>-  <script src="/resources/testharness.js" type="text/javascript"></script>
>-  <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>-  <style id="styleElement">
>-      #test { color: green; }
>-  </style>
>- </head>
>- <body>
>- <div id="log"></div>
>- <div id="test"></div>
>- <script type="text/javascript">
>-    var declaration;
>-    setup(function() {
>-        var styleElement = document.getElementById("styleElement");
>-        declaration = styleElement.sheet.cssRules.item(0).style;
>-    });
>-
>-    test(function() {
>-        assert_equals(declaration.cssText, "color: green;");
>-        assert_equals(declaration.getPropertyValue("color"), "green");
>-    }, "Reading CSSStyleDeclaration initialized from a style element");
>-
>-    test(function() {
>-        declaration.cssText = "margin-left:10px;  padding-left:10px";
>-        assert_equals(declaration.cssText, "margin-left: 10px; padding-left: 10px;");
>-        assert_equals(declaration.length, 2);
>-        assert_equals(declaration.item(0), "margin-left");
>-        assert_equals(declaration.item(1), "padding-left");
>-        assert_equals(declaration.getPropertyValue("margin-left"), "10px");
>-        assert_equals(declaration.getPropertyValue("padding-left"), "10px");
>-
>-        var computedStyle = window.getComputedStyle(document.getElementById("test"));
>-        assert_equals(computedStyle.getPropertyValue("margin-left"), "10px");
>-        assert_equals(computedStyle.getPropertyValue("padding-left"), "10px");
>-    }, "Setting CSSStyleDeclaration#cssText");
>-
>-    test(function() {
>-        while (declaration.length > 0) {
>-            declaration.removeProperty(declaration.item(0));
>-        }
>-        declaration.setProperty("margin-left", "15px");
>-        declaration.setProperty("padding-left", "15px");
>-
>-        assert_equals(declaration.length, 2);
>-        assert_equals(declaration.item(0), "margin-left");
>-        assert_equals(declaration.item(1), "padding-left");
>-        assert_equals(declaration.getPropertyValue("margin-left"), "15px");
>-        assert_equals(declaration.getPropertyValue("padding-left"), "15px");
>-
>-        var computedStyle = window.getComputedStyle(document.getElementById("test"));
>-        assert_equals(computedStyle.getPropertyValue("margin-left"), "15px");
>-        assert_equals(computedStyle.getPropertyValue("padding-left"), "15px");
>-    }, "Calling CSSStyleDeclaration#setProperty");
>- </script>
>- </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssimportrule-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssimportrule-expected.txt
>deleted file mode 100644
>index 25fc941da5544acd994b9652936b0b5b6a2b5aa6..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssimportrule-expected.txt
>+++ /dev/null
>@@ -1,8 +0,0 @@
>-
>-PASS CSSRule and CSSImportRule types 
>-PASS Type of CSSRule#type and constant values 
>-PASS Existence and writability of CSSRule attributes 
>-PASS Values of CSSRule attributes 
>-PASS Existence and writability of CSSImportRule attributes 
>-PASS Values of CSSImportRule attributes 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssimportrule.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssimportrule.html
>deleted file mode 100644
>index d4a3250e680739dddf490b54ae0deda792ef6999..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssimportrule.html
>+++ /dev/null
>@@ -1,88 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-<head>
>-    <title>CSSOM CSSRule CSSImportRule interface</title>
>-    <link rel="author" title="Letitia Lew" href="mailto:lew.letitia@gmail.com">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-rules">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssimportrule-interface">
>-    <meta name="flags" content="dom">
>-    <meta name="assert" content="All properties for this CSSImportRule instance of CSSRule are initialized correctly">
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-
>-    <style id="styleElement" type="text/css">
>-        @import url("support/a-green.css");
>-        @import url("support/a-green.css") screen;
>-    </style>
>-</head>
>-<body>
>-    <div id="log"></div>
>-
>-    <script type="text/javascript">
>-        var rule, ruleWithMedia;
>-        setup(function() {
>-            var styleSheet = document.getElementById("styleElement").sheet;
>-            var ruleList = styleSheet.cssRules;
>-            rule = ruleList[0];
>-            ruleWithMedia = ruleList[1];
>-        });
>-
>-        test(function() {
>-            assert_true(rule instanceof CSSRule);
>-            assert_true(rule instanceof CSSImportRule);
>-            assert_true(ruleWithMedia instanceof CSSRule);
>-            assert_true(ruleWithMedia instanceof CSSImportRule);
>-        }, "CSSRule and CSSImportRule types");
>-
>-        test(function() {
>-            assert_equals(rule.STYLE_RULE, 1);
>-            assert_equals(rule.IMPORT_RULE, 3);
>-            assert_equals(rule.MEDIA_RULE, 4);
>-            assert_equals(rule.FONT_FACE_RULE, 5);
>-            assert_equals(rule.PAGE_RULE, 6);
>-            assert_equals(rule.NAMESPACE_RULE, 10);
>-            assert_idl_attribute(rule, "type");
>-            assert_equals(typeof rule.type, "number");
>-        }, "Type of CSSRule#type and constant values");
>-
>-        test(function() {
>-            assert_true(rule instanceof CSSRule);
>-            assert_idl_attribute(rule, "cssText");
>-            assert_idl_attribute(rule, "parentRule");
>-            assert_idl_attribute(rule, "parentStyleSheet");
>-
>-            assert_readonly(rule, "type");
>-            assert_readonly(rule, "parentRule");
>-            assert_readonly(rule, "parentStyleSheet");
>-        }, "Existence and writability of CSSRule attributes");
>-
>-        test(function() {
>-            assert_equals(rule.type, rule.IMPORT_RULE);
>-            assert_equals(typeof rule.cssText, "string");
>-            assert_equals(rule.cssText, '@import url("support/a-green.css");');
>-            assert_equals(ruleWithMedia.cssText, '@import url("support/a-green.css") screen;');
>-            assert_equals(rule.parentRule, null);
>-            assert_true(rule.parentStyleSheet instanceof CSSStyleSheet);
>-        }, "Values of CSSRule attributes");
>-
>-        test(function() {
>-            assert_idl_attribute(rule, "href");
>-            assert_idl_attribute(rule, "media");
>-            assert_idl_attribute(rule, "styleSheet");
>-
>-            assert_readonly(rule, "href");
>-            assert_readonly(rule, "media");
>-            assert_readonly(rule, "styleSheet");
>-        }, "Existence and writability of CSSImportRule attributes");
>-
>-        test(function() {
>-            assert_equals(typeof rule.href, "string");
>-            assert_true(rule.media instanceof MediaList);
>-            assert_true(rule.styleSheet instanceof CSSStyleSheet);
>-            assert_true(ruleWithMedia.media.length > 0);
>-            assert_equals(ruleWithMedia.media.mediaText, "screen");
>-        }, "Values of CSSImportRule attributes");
>-    </script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssText-serialize-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssText-serialize-expected.txt
>deleted file mode 100644
>index 04e11aa7e9643e2b3b8f696e36b9fb9e396b7449..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssText-serialize-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-PASS CSSStyleDeclaration cssText serializes declaration blocks. 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssText-serialize.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssText-serialize.html
>deleted file mode 100644
>index 27479f026df6b9b2b419f86fcdc0da001ffcbe5b..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssText-serialize.html
>+++ /dev/null
>@@ -1,28 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-    <head>
>-        <title>CSSOM Parsing Test: getting cssText must return the result of serializing the CSS declaration blocks.</title>
>-        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
>-        <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
>-
>-        <link rel="source" href="http://trac.webkit.org/export/120528/trunk/LayoutTests/fast/css/cssText-cache.html">
>-        <meta name="flags" content="dom">
>-
>-        <script src="/resources/testharness.js"></script>
>-        <script src="/resources/testharnessreport.js"></script>
>-    </head>
>-
>-    <body>
>-        <div id="log"></div>
>-        <div id="box"></div>
>-        <script>
>-          test(function() {
>-            var style = document.getElementById('box').style;
>-            style.left = "10px";
>-            assert_equals(style.cssText, "left: 10px;");
>-            style.right = "20px";
>-            assert_equals(style.cssText, "left: 10px; right: 20px;");
>-          }, 'CSSStyleDeclaration cssText serializes declaration blocks.');
>-        </script>
>-    </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssstyledeclaration-set-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssstyledeclaration-set-expected.txt
>deleted file mode 100644
>index c6c1f9611ca75912c071511c65c3035e4f0f04c6..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssstyledeclaration-set-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-PASS CSSStyleDeclaration on HTMLElement represents inline style changes 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssstyledeclaration-set.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssstyledeclaration-set.html
>deleted file mode 100644
>index 1fb7ccd32499bb5ee55ce49e1189d6f073212a30..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssstyledeclaration-set.html
>+++ /dev/null
>@@ -1,37 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-    <head>
>-        <title>CSSOM: CSSStyleDeclaration on HTMLElement represents inline style changes</title>
>-        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
>-        <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
>-
>-        <link rel="source" href="http://trac.webkit.org/export/120528/trunk/LayoutTests/fast/css/cssText-cache.html">
>-        <meta name="flags" content="dom">
>-
>-        <script src="/resources/testharness.js"></script>
>-        <script src="/resources/testharnessreport.js"></script>
>-    </head>
>-
>-    <body>
>-        <div id="log"></div>
>-
>-        <div id="box"></div>
>-
>-        <script>
>-
>-          var style = document.getElementById('box').style;
>-
>-          test(function(){
>-
>-            style.left = "10px";
>-            assert_equals(style.left, "10px", 'left property set on element\'s CSSStyleDeclaration Object');
>-            style.left = "20px";
>-            assert_equals(style.left, "20px", 'left property set on element\'s CSSStyleDeclaration Object');
>-
>-          }, 'CSSStyleDeclaration on HTMLElement represents inline style changes');
>-
>-        </script>
>-
>-
>-    </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule-constructors-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule-constructors-expected.txt
>deleted file mode 100644
>index 4107427a1d4de19b3478028778a2ab234544afd4..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule-constructors-expected.txt
>+++ /dev/null
>@@ -1,4 +0,0 @@
>-
>-PASS @font-face declarations are instances of CSSFontFaceRule 
>-PASS The style attribute must return a CSSStyleDeclaration block 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule-constructors.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule-constructors.html
>deleted file mode 100644
>index df47d1b24aaded5f44dbfe464f878512b63f34b3..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule-constructors.html
>+++ /dev/null
>@@ -1,63 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-    <head>
>-        <title>CSSOM Parsing Test: @font-face rules toString() as valid interfaces</title>
>-        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
>-        <link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> 
>-        <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-font-face-rule">
>-
>-        <meta name="flags" content="dom">
>-
>-        <script src="/resources/testharness.js"></script>
>-        <script src="/resources/testharnessreport.js"></script>
>-    </head>
>-
>-    <body>
>-        <div id="log"></div>
>-
>-
>-        <style id="teststyles">
>-        @font-face {
>-            src: url(http://foo/bar/font.ttf);
>-        }
>-        @font-face {
>-            font-family: STIXGeneral;
>-            src: local(STIXGeneral), url(/stixfonts/STIXGeneral.otf);
>-            unicode-range: U+000-49F, U+2000-27FF, U+2900-2BFF, U+1D400-1D7FF;
>-        }
>-        @font-face {
>-            font-family: MainText;
>-            src: url(http://example.com/font.ttf);
>-            font-variant: oldstyle-nums proportional-nums styleset(1,3);
>-        }
>-
>-       @font-face {
>-            font-family: BodyText;
>-            src: local("HiraMaruPro-W4");
>-            font-variant: proportional-width;
>-            font-feature-settings: "ital"; /* Latin italics within CJK text feature */
>-        }
>-        </style>
>-
>-
>-        <script>
>-            var validRules = document.getElementById('teststyles').sheet.cssRules;
>-
>-            test(function(){
>-                for (var i = 0; i < validRules.length; ++i) {
>-                    assert_equals(validRules.item(i).toString(), '[object CSSFontFaceRule]');
>-                }
>-            }, '@font-face declarations are instances of CSSFontFaceRule')
>-
>-
>-            test(function(){
>-                for (var i = 0; i < validRules.length; ++i) {
>-                    assert_equals(validRules.item(i).style.toString(), '[object CSSStyleDeclaration]');
>-                }
>-            }, 'The style attribute must return a CSSStyleDeclaration block')
>-
>-        </script>
>-
>-
>-    </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule-expected.txt
>deleted file mode 100644
>index a321a09d9db06fd78ce20ecc736b48c734194fe4..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-PASS CSSStyleDeclaration values are represented within CSSFontFaceRule 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule.html
>deleted file mode 100644
>index 06209101c38a631ad82167943fa21782e31c8ba9..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule.html
>+++ /dev/null
>@@ -1,58 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-    <head>
>-        <title>CSSOM Parsing Test: @font-face rules parsed into CSSOM CSSFontFaceRules</title>
>-        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
>-        <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-font-face-rule">
>-
>-        <meta name="flags" content="dom">
>-
>-        <script src="/resources/testharness.js"></script>
>-        <script src="/resources/testharnessreport.js"></script>
>-    </head>
>-
>-    <body>
>-        <div id="log"></div>
>-
>-
>-        <style id="teststyles">
>-        @font-face {
>-            src: url(http://foo/bar/font.ttf);
>-        }
>-        @font-face {
>-            font-family: STIXGeneral;
>-            src: local(STIXGeneral), url(/stixfonts/STIXGeneral.otf);
>-            unicode-range: U+000-49F, U+2000-27FF, U+2900-2BFF, U+1D400-1D7FF;
>-        }
>-        @font-face {
>-            font-family: MainText;
>-            src: url(http://example.com/font.ttf);
>-            font-variant: oldstyle-nums proportional-nums styleset(1,3);
>-        }
>-
>-       @font-face {
>-            font-family: BodyText;
>-            src: local("HiraMaruPro-W4");
>-            font-variant: proportional-width;
>-            font-feature-settings: "ital"; /* Latin italics within CJK text feature */
>-        }
>-        </style>
>-
>-
>-        <script>
>-            var validRules = document.getElementById('teststyles').sheet.cssRules;
>-
>-            test(function(){
>-
>-                assert_equals(validRules[0].style.src, 'url(http://foo/bar/font.ttf)');
>-                assert_equals(validRules[1].style.fontFamily, 'STIXGeneral');
>-
>-                /* unimplemented @font-face properties are not represented in CSSOM */
>-
>-            }, 'CSSStyleDeclaration values are represented within CSSFontFaceRule')
>-
>-        </script>
>-
>-
>-    </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-ruleTypeAndOrder-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-ruleTypeAndOrder-expected.txt
>deleted file mode 100644
>index c89a92434a195f6671bbf86f0cfea92714dad88b..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-ruleTypeAndOrder-expected.txt
>+++ /dev/null
>@@ -1,9 +0,0 @@
>-
>-PASS Type of #s-0 is expected to be namespace rule 
>-PASS Type of #s-1 is expected to be @import rule 
>-PASS Type of #s-2 is expected to be style rule 
>-PASS Type of #s-3 is expected to be style rule 
>-PASS Type of #s-4 is expected to be @font-face rule 
>-PASS Type of #s-5 is expected to be media rule 
>-PASS Type of #s-6 is expected to be page rule 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-ruleTypeAndOrder.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-ruleTypeAndOrder.html
>deleted file mode 100644
>index 19aab35357ce1c52080c69dcba4cf2e885c36a1a..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-ruleTypeAndOrder.html
>+++ /dev/null
>@@ -1,75 +0,0 @@
>-<!doctype html>
>-<head>
>-  <title>CSS OM: CSS Rule Types and Order</title>
>-  <link rel="help" href="https://drafts.csswg.org/cssom-1/#the-cssrule-interface">
>-  <meta name="flags" content="dom">
>-  <meta name="assert" content="Testing Serialization of Style Rules">
>-  <script src="/resources/testharness.js"></script>
>-  <script src="/resources/testharnessreport.js"></script>
>-  <style id="s-0">
>-    @namespace svg "http://www.w3.org/2000/svg";
>-  </style>
>-  <style id="s-1">
>-    @import url('main.css');
>-  </style>
>-  <style id="s-2">
>-    h1 { background: indianred; }
>-  </style>
>-  <style id="s-3">
>-    @namespace svg "http://www.w3.org/2000/svg";
>-    svg|a { color: white; }
>-  </style>
>-  <style id="s-4">
>-    @font-face {
>-      font-family: 'Megalopolis';
>-      src: url('fonts/megalopolisextra-webfont.eot');
>-      src: url('fonts/megalopolisextra-webfont.eot?#iefix') format('embedded-opentype'),
>-           url('fonts/megalopolisextra-webfont.woff') format('woff'),
>-           url('fonts/megalopolisextra-webfont.ttf') format('truetype'),
>-           url('fonts/megalopolisextra-webfont.svg#MEgalopolisExtraRegular') format('svg');
>-      font-weight: normal;
>-      font-style: normal;
>-    }
>-  </style>
>-  <style id="s-5">
>-    @media (min-width: 200px) {
>-        h1 { background: aliceblue; }
>-    }
>-  </style>
>-  <style id="s-6">
>-    @page :first {
>-        h1 { color: #444; }
>-    }
>-  </style>
>-</head>
>-<body>
>-  <div id="log"></div>
>-  <script type="text/javascript">
>-    "use strict";
>-
>-    var stylesheets = document.styleSheets;
>-
>-    var expectedOrderOfTypes = [10, 3, 1, 1, 5, 4, 6];
>-
>-    var typesText = {
>-      1: 'style rule',
>-      3: '@import rule',
>-      4: 'media rule',
>-      5: '@font-face rule',
>-      6: 'page rule',
>-      10: 'namespace rule'
>-    };
>-
>-    for (var i = 0; i < stylesheets.length; i++) {
>-      test( function () {
>-          if (i === 3) {
>-            var cssType = stylesheets[i].cssRules[1].type;
>-          } else {
>-            var cssType = stylesheets[i].cssRules[0].type;
>-          }
>-          assert_equals(typesText[cssType], typesText[expectedOrderOfTypes[i]]);
>-      }, 'Type of #s-' + i + ' is expected to be ' + typesText[expectedOrderOfTypes[i]]);
>-    }
>-  </script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-setProperty-shorthand-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-setProperty-shorthand-expected.txt
>deleted file mode 100644
>index 97663b57a7e2742c329a59e09d84d91f05e7765c..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-setProperty-shorthand-expected.txt
>+++ /dev/null
>@@ -1,78 +0,0 @@
>-
>-PASS shorthand font can be set with setProperty 
>-PASS shorthand font can be removed with removeProperty 
>-PASS shorthand font can be set with setProperty and priority !important 
>-PASS shorthand font can be removed with removeProperty even when set with !important 
>-PASS shorthand border-top can be set with setProperty 
>-PASS shorthand border-top can be removed with removeProperty 
>-PASS shorthand border-top can be set with setProperty and priority !important 
>-PASS shorthand border-top can be removed with removeProperty even when set with !important 
>-PASS shorthand border-right can be set with setProperty 
>-PASS shorthand border-right can be removed with removeProperty 
>-PASS shorthand border-right can be set with setProperty and priority !important 
>-PASS shorthand border-right can be removed with removeProperty even when set with !important 
>-PASS shorthand border-bottom can be set with setProperty 
>-PASS shorthand border-bottom can be removed with removeProperty 
>-PASS shorthand border-bottom can be set with setProperty and priority !important 
>-PASS shorthand border-bottom can be removed with removeProperty even when set with !important 
>-PASS shorthand border-left can be set with setProperty 
>-PASS shorthand border-left can be removed with removeProperty 
>-PASS shorthand border-left can be set with setProperty and priority !important 
>-PASS shorthand border-left can be removed with removeProperty even when set with !important 
>-PASS shorthand border can be set with setProperty 
>-PASS shorthand border can be removed with removeProperty 
>-PASS shorthand border can be set with setProperty and priority !important 
>-PASS shorthand border can be removed with removeProperty even when set with !important 
>-PASS shorthand border-color can be set with setProperty 
>-PASS shorthand border-color can be removed with removeProperty 
>-PASS shorthand border-color can be set with setProperty and priority !important 
>-PASS shorthand border-color can be removed with removeProperty even when set with !important 
>-PASS shorthand border-style can be set with setProperty 
>-PASS shorthand border-style can be removed with removeProperty 
>-PASS shorthand border-style can be set with setProperty and priority !important 
>-PASS shorthand border-style can be removed with removeProperty even when set with !important 
>-PASS shorthand border-width can be set with setProperty 
>-PASS shorthand border-width can be removed with removeProperty 
>-PASS shorthand border-width can be set with setProperty and priority !important 
>-PASS shorthand border-width can be removed with removeProperty even when set with !important 
>-PASS shorthand background-position can be set with setProperty 
>-PASS shorthand background-position can be removed with removeProperty 
>-PASS shorthand background-position can be set with setProperty and priority !important 
>-PASS shorthand background-position can be removed with removeProperty even when set with !important 
>-PASS shorthand background-repeat can be set with setProperty 
>-PASS shorthand background-repeat can be removed with removeProperty 
>-PASS shorthand background-repeat can be set with setProperty and priority !important 
>-PASS shorthand background-repeat can be removed with removeProperty even when set with !important 
>-PASS shorthand border-spacing can be set with setProperty 
>-PASS shorthand border-spacing can be removed with removeProperty 
>-PASS shorthand border-spacing can be set with setProperty and priority !important 
>-PASS shorthand border-spacing can be removed with removeProperty even when set with !important 
>-PASS shorthand list-style can be set with setProperty 
>-PASS shorthand list-style can be removed with removeProperty 
>-PASS shorthand list-style can be set with setProperty and priority !important 
>-PASS shorthand list-style can be removed with removeProperty even when set with !important 
>-PASS shorthand margin can be set with setProperty 
>-PASS shorthand margin can be removed with removeProperty 
>-PASS shorthand margin can be set with setProperty and priority !important 
>-PASS shorthand margin can be removed with removeProperty even when set with !important 
>-PASS shorthand outline can be set with setProperty 
>-PASS shorthand outline can be removed with removeProperty 
>-PASS shorthand outline can be set with setProperty and priority !important 
>-PASS shorthand outline can be removed with removeProperty even when set with !important 
>-PASS shorthand padding can be set with setProperty 
>-PASS shorthand padding can be removed with removeProperty 
>-PASS shorthand padding can be set with setProperty and priority !important 
>-PASS shorthand padding can be removed with removeProperty even when set with !important 
>-PASS shorthand background can be set with setProperty 
>-PASS shorthand background can be removed with removeProperty 
>-PASS shorthand background can be set with setProperty and priority !important 
>-PASS shorthand background can be removed with removeProperty even when set with !important 
>-PASS shorthand overflow can be set with setProperty 
>-PASS shorthand overflow can be removed with removeProperty 
>-PASS shorthand overflow can be set with setProperty and priority !important 
>-PASS shorthand overflow can be removed with removeProperty even when set with !important 
>-PASS shorthand border-radius can be set with setProperty 
>-PASS shorthand border-radius can be removed with removeProperty 
>-PASS shorthand border-radius can be set with setProperty and priority !important 
>-PASS shorthand border-radius can be removed with removeProperty even when set with !important 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-setProperty-shorthand.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-setProperty-shorthand.html
>deleted file mode 100644
>index 4c0f9a2f9392bd8e85c2d092db382fcc0cc06c2e..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-setProperty-shorthand.html
>+++ /dev/null
>@@ -1,77 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-    <head>
>-        <title>CSSOM: CSSStyleDeclaration (set|remove)PropertyValue sets/removes shorthand properties</title>
>-        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
>-        <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
>-
>-        <link rel="source" href="http://trac.webkit.org/export/120528/trunk/LayoutTests/fast/css/cssom-remove-shorthand-property.html">
>-        <meta name="flags" content="dom">
>-
>-        <script src="/resources/testharness.js"></script>
>-        <script src="/resources/testharnessreport.js"></script>
>-    </head>
>-
>-    <body>
>-        <div id="log"></div>
>-
>-        <div id="box"></div>
>-
>-        <script>
>-            shorthandProperties = [
>-                "font",
>-                "border-top",
>-                "border-right",
>-                "border-bottom",
>-                "border-left",
>-                "border",
>-                "border-color",
>-                "border-style",
>-                "border-width",
>-                "background-position",
>-                "background-repeat",
>-                "border-spacing",
>-                "list-style",
>-                "margin",
>-                "outline",
>-                "padding",
>-                "background",
>-                "overflow",
>-                "border-radius"
>-            ];
>-
>-            element = document.createElement('span');
>-
>-            function canSetProperty(propertyName, priority) {
>-                element.style.setProperty(propertyName, 'initial', priority);
>-                return element.style.getPropertyValue(propertyName) == 'initial';
>-            }
>-
>-            function canRemoveProperty(propertyName) {
>-                element.style.removeProperty(propertyName);
>-                return element.style.getPropertyValue(propertyName) != 'initial';
>-            }
>-
>-            for (i = 0; i < shorthandProperties.length; ++i) {
>-                var propertyName = shorthandProperties[i];
>-
>-                test(function(){
>-                    assert_true(canSetProperty(propertyName, ''), 'can setPropertyValue with shorthand');
>-                }, 'shorthand ' + propertyName + ' can be set with setProperty');
>-
>-                test(function(){
>-                    assert_true(canRemoveProperty(propertyName), 'can setPropertyValue with shorthand');
>-                }, 'shorthand ' + propertyName + ' can be removed with removeProperty');
>-
>-                test(function(){
>-                    assert_true(canSetProperty(propertyName, 'important'), 'can setPropertyValue with shorthand');
>-                }, 'shorthand ' + propertyName + ' can be set with setProperty and priority !important');
>-
>-                test(function(){
>-                    assert_true(canRemoveProperty(propertyName), 'can setPropertyValue with shorthand');
>-                }, 'shorthand ' + propertyName + ' can be removed with removeProperty even when set with !important');
>-
>-            }
>-        </script>
>-    </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-csstext-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-csstext-expected.txt
>deleted file mode 100644
>index 81e9efeb8ac663743caa1c77f38fdfb3c9f7d229..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-csstext-expected.txt
>+++ /dev/null
>@@ -1,10 +0,0 @@
>-
>-PASS uppercase property 
>-PASS uppercase value 
>-PASS overwriting with invalid value 
>-PASS use rgb 
>-PASS cssText order 
>-PASS another cssText order (non-alphabetical order) 
>-PASS whitespaces in value 
>-PASS invalid property does not appear 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-csstext.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-csstext.html
>deleted file mode 100644
>index c3ad37ae2a66a06a90ab713547cb58d60fd2f5e4..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-csstext.html
>+++ /dev/null
>@@ -1,102 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-    <head>
>-        <title>CSSOM Test: CSSStyleDeclaration.cssText Test</title>
>-        <link rel="author" title="kkoichi" href="mailto:coarse.ground@gmail.com">
>-        <link rel="reviewer" title="Simon Pieters" href="mailto:simonp@opera.com">
>-        <link rel="help" href="https://drafts.csswg.org/cssom-1/#dom-cssstyledeclaration-csstext">
>-        <meta name="assert" content="CSS declarations is serialized as expected">
>-        <meta name="flags" content="dom">
>-        <script src="/resources/testharness.js"></script>
>-        <script src="/resources/testharnessreport.js"></script>
>-    </head>
>-    <body>
>-    <div id="log"></div>
>-    <script>
>-        function newElm() {
>-            return document.body.appendChild(document.createElement('div'));
>-        }
>-
>-        test(function(){
>-            var style = newElm().style;
>-            style.COLOR = 'red';
>-
>-            assert_equals(style.cssText, '');
>-
>-        }, 'uppercase property');
>-
>-        test(function(){
>-            var style = newElm().style;
>-            style.color = 'RED';
>-
>-            // https://www.w3.org/Bugs/Public/show_bug.cgi?id=29317
>-            assert_any(assert_equals, style.cssText, ['color: red;', 'color: RED;']);
>-
>-        }, 'uppercase value');
>-
>-        test(function(){
>-            var style = newElm().style;
>-
>-            style.color = 'red';
>-
>-            style.color = 'unknown color';
>-
>-            assert_equals(style.cssText, 'color: red;');
>-
>-        }, 'overwriting with invalid value');
>-
>-        test(function(){
>-            var style = newElm().style;
>-            style.color = 'rgb(255, 0, 0)';
>-
>-            assert_equals(style.cssText, 'color: rgb(255, 0, 0);');
>-
>-        }, 'use rgb');
>-
>-        test(function(){
>-            var e = newElm();
>-            var style = e.style;
>-
>-            style.color = 'red';
>-            style.fontSize = '10pt';
>-            style.fontWeight = 'bold';
>-
>-            assert_equals(style.cssText, 'color: red; font-size: 10pt; font-weight: bold;');
>-
>-        }, 'cssText order');
>-
>-        test(function(){
>-            var e = newElm();
>-            var style = e.style;
>-
>-            style.fontWeight = 'bold';
>-            style.color = 'red';
>-            style.fontSize = '10pt';
>-
>-            assert_equals(style.cssText, 'font-weight: bold; color: red; font-size: 10pt;');
>-
>-        }, 'another cssText order (non-alphabetical order)');
>-
>-        test(function(){
>-            var style = newElm().style;
>-
>-            style.color = '   red';
>-            style.fontSize = '10pt   ';
>-
>-            assert_equals(style.cssText, 'color: red; font-size: 10pt;');
>-
>-        }, 'whitespaces in value');
>-
>-        test(function(){
>-            var style = newElm().style;
>-
>-            style.color = 'red';
>-            style.unknown = 'unknown';
>-            style.fontSize = '10pt';
>-            assert_equals(style.cssText, 'color: red; font-size: 10pt;');
>-
>-        }, 'invalid property does not appear');
>-
>-    </script>
>-    </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-mutability-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-mutability-expected.txt
>deleted file mode 100644
>index c64766ad6509e1acc75e07a3e9705ea3f635bedf..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-mutability-expected.txt
>+++ /dev/null
>@@ -1,5 +0,0 @@
>-
>-PASS HTMLElement's CSSStyleDeclaration is mutable 
>-PASS getComputedStyle's CSSStyleDeclaration is not mutable 
>-PASS StyleSheet's CSSStyleDeclaration is mutable 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-mutability.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-mutability.html
>deleted file mode 100644
>index 6b4c78f7190941a61904360f548003c6cc6c9ec4..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-mutability.html
>+++ /dev/null
>@@ -1,69 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-    <head>
>-        <title>CSSOM: CSSStyleDeclaration is mutable and immutable in various settings</title>
>-        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
>-        <link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> 
>-        <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
>-
>-        <meta name="flags" content="dom">
>-
>-        <script src="/resources/testharness.js"></script>
>-        <script src="/resources/testharnessreport.js"></script>
>-    </head>
>-
>-    <body>
>-        <div id="log"></div>
>-        <div id="box"></box>
>-        <div id="box2"></box>
>-        <style id="teststyles">
>-            #box2 { width: 15px; }
>-        </style>
>-        <script>
>-
>-            test(function(){
>-                var elem = document.getElementById('box');
>-
>-                elem.style.width = '10px';
>-                assert_equals(elem.style.width, '10px', 'setting via style property');
>-                elem.style.width = '';
>-
>-                elem.style.cssText = 'width: 10px';
>-                assert_equals(elem.style.width, '10px', 'setting via cssText');
>-                elem.style.width = '';
>-
>-            }, 'HTMLElement\'s CSSStyleDeclaration is mutable')
>-
>-
>-            test(function(){
>-                var elem = document.getElementById('box');
>-                var style = getComputedStyle(elem, 'width');
>-
>-                assert_throws('NO_MODIFICATION_ALLOWED_ERR', function(){
>-                    style.width = '10px';
>-                });
>-
>-            }, 'getComputedStyle\'s CSSStyleDeclaration is not mutable')
>-
>-
>-            test(function(){
>-
>-                var style = document.getElementById('teststyles').sheet.cssRules[0].style;
>-
>-                assert_equals(style.width, '15px', 'width value is correct');
>-
>-                style.width = '25px';
>-
>-                assert_equals(style.width, '25px', 'width value is mutable');
>-
>-                var gCSstyle = getComputedStyle(document.getElementById('box2'));
>-
>-                assert_equals(gCSstyle.width, '25px', 'styleSheet change is live and accesible via getComputedStyle');
>-
>-            }, 'StyleSheet\'s CSSStyleDeclaration is mutable');
>-
>-
>-        </script>
>-
>-    </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/escape-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/escape-expected.txt
>deleted file mode 100644
>index 76ee47af3b06ba5398dd33d70e7313675ddd184b..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/escape-expected.txt
>+++ /dev/null
>@@ -1,12 +0,0 @@
>-
>-PASS Number of arguments 
>-PASS String conversion 
>-PASS Null bytes 
>-PASS Replacement character 
>-PASS Number prefix 
>-PASS Letter number prefix 
>-PASS Dash number prefix 
>-PASS Double dash prefix 
>-PASS Various tests 
>-PASS Surrogates 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/escape.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/escape.html
>deleted file mode 100644
>index 115e2c86a9a0d8e1ea7465ecf5143a42e1104c85..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/escape.html
>+++ /dev/null
>@@ -1,98 +0,0 @@
>-<!doctype html>
>-<meta charset=utf-8>
>-<title>CSS#escape</title>
>-<link rel=help href=https://drafts.csswg.org/cssom-1/#the-css.escape()-method>
>-<script src=/resources/testharness.js></script>
>-<script src=/resources/testharnessreport.js></script>
>-<div id=log></div>
>-<script>
>-test(function() {
>-  assert_equals(CSS.escape.length, 1);
>-  assert_throws(new TypeError(), function() { CSS.escape(); });
>-}, "Number of arguments");
>-
>-test(function() {
>-  assert_equals(CSS.escape(true), 'true');
>-  assert_equals(CSS.escape(false), 'false');
>-  assert_equals(CSS.escape(null), 'null');
>-  assert_equals(CSS.escape(''), '');
>-}, "String conversion");
>-
>-test(function() {
>-  assert_equals(CSS.escape('\0'), '\uFFFD');
>-  assert_equals(CSS.escape('a\0'), 'a\uFFFD');
>-  assert_equals(CSS.escape('\0b'), '\uFFFDb');
>-  assert_equals(CSS.escape('a\0b'), 'a\uFFFDb');
>-}, "Null bytes");
>-
>-test(function() {
>-  assert_equals(CSS.escape('\uFFFD'), '\uFFFD');
>-  assert_equals(CSS.escape('a\uFFFD'), 'a\uFFFD');
>-  assert_equals(CSS.escape('\uFFFDb'), '\uFFFDb');
>-  assert_equals(CSS.escape('a\uFFFDb'), 'a\uFFFDb');
>-}, "Replacement character");
>-
>-test(function() {
>-  assert_equals(CSS.escape('0a'), '\\30 a');
>-  assert_equals(CSS.escape('1a'), '\\31 a');
>-  assert_equals(CSS.escape('2a'), '\\32 a');
>-  assert_equals(CSS.escape('3a'), '\\33 a');
>-  assert_equals(CSS.escape('4a'), '\\34 a');
>-  assert_equals(CSS.escape('5a'), '\\35 a');
>-  assert_equals(CSS.escape('6a'), '\\36 a');
>-  assert_equals(CSS.escape('7a'), '\\37 a');
>-  assert_equals(CSS.escape('8a'), '\\38 a');
>-  assert_equals(CSS.escape('9a'), '\\39 a');
>-}, "Number prefix");
>-
>-test(function() {
>-  assert_equals(CSS.escape('a0b'), 'a0b');
>-  assert_equals(CSS.escape('a1b'), 'a1b');
>-  assert_equals(CSS.escape('a2b'), 'a2b');
>-  assert_equals(CSS.escape('a3b'), 'a3b');
>-  assert_equals(CSS.escape('a4b'), 'a4b');
>-  assert_equals(CSS.escape('a5b'), 'a5b');
>-  assert_equals(CSS.escape('a6b'), 'a6b');
>-  assert_equals(CSS.escape('a7b'), 'a7b');
>-  assert_equals(CSS.escape('a8b'), 'a8b');
>-  assert_equals(CSS.escape('a9b'), 'a9b');
>-}, "Letter number prefix");
>-
>-test(function() {
>-  assert_equals(CSS.escape('-0a'), '-\\30 a');
>-  assert_equals(CSS.escape('-1a'), '-\\31 a');
>-  assert_equals(CSS.escape('-2a'), '-\\32 a');
>-  assert_equals(CSS.escape('-3a'), '-\\33 a');
>-  assert_equals(CSS.escape('-4a'), '-\\34 a');
>-  assert_equals(CSS.escape('-5a'), '-\\35 a');
>-  assert_equals(CSS.escape('-6a'), '-\\36 a');
>-  assert_equals(CSS.escape('-7a'), '-\\37 a');
>-  assert_equals(CSS.escape('-8a'), '-\\38 a');
>-  assert_equals(CSS.escape('-9a'), '-\\39 a');
>-}, "Dash number prefix");
>-
>-test(function() {
>-  assert_equals(CSS.escape('--a'), '--a');
>-}, "Double dash prefix");
>-
>-test(function() {
>-  assert_equals(CSS.escape('\x01\x02\x1E\x1F'), '\\1 \\2 \\1e \\1f ');
>-
>-  assert_equals(CSS.escape('\x80\x2D\x5F\xA9'), '\x80\x2D\x5F\xA9');
>-  assert_equals(CSS.escape('\x7F\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8A\x8B\x8C\x8D\x8E\x8F\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9A\x9B\x9C\x9D\x9E\x9F'), '\\7f \x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8A\x8B\x8C\x8D\x8E\x8F\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9A\x9B\x9C\x9D\x9E\x9F');
>-  assert_equals(CSS.escape('\xA0\xA1\xA2'), '\xA0\xA1\xA2');
>-  assert_equals(CSS.escape('a0123456789b'), 'a0123456789b');
>-  assert_equals(CSS.escape('abcdefghijklmnopqrstuvwxyz'), 'abcdefghijklmnopqrstuvwxyz');
>-  assert_equals(CSS.escape('ABCDEFGHIJKLMNOPQRSTUVWXYZ'), 'ABCDEFGHIJKLMNOPQRSTUVWXYZ');
>-
>-  assert_equals(CSS.escape('\x20\x21\x78\x79'), '\\ \\!xy');
>-}, "Various tests");
>-
>-test(function() {
>-  // astral symbol (U+1D306 TETRAGRAM FOR CENTRE)
>-  assert_equals(CSS.escape('\uD834\uDF06'), '\uD834\uDF06');
>-  // lone surrogates
>-  assert_equals(CSS.escape('\uDF06'), '\uDF06');
>-  assert_equals(CSS.escape('\uD834'), '\uD834');
>-}, "Surrogates");
>-</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/getComputedStyle-pseudo-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/getComputedStyle-pseudo-expected.txt
>deleted file mode 100644
>index e68727308424386b9f59df5bc06d8c898238838a..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/getComputedStyle-pseudo-expected.txt
>+++ /dev/null
>@@ -1,9 +0,0 @@
>-
>-PASS Resolution of width is correct for ::before and ::after pseudo-elements 
>-PASS Resolution of width is correct for ::before and ::after pseudo-elements of display: contents elements 
>-PASS Resolution of nonexistent pseudo-element styles 
>-FAIL Resolution of pseudo-element styles in display: none elements assert_equals: Pseudo-styles of display: none elements should be correct expected "\"Foo\"" but got "Foo"
>-PASS Item-based blockification of pseudo-elements 
>-FAIL Item-based blockification of nonexistent pseudo-elements assert_equals: Pseudo-styles of display: flex elements should get blockified expected "block" but got "inline"
>-PASS display: contents on pseudo-elements 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/getComputedStyle-pseudo.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/getComputedStyle-pseudo.html
>deleted file mode 100644
>index ec7a863a94c072a975e97e56fd8299dd0a2219e0..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/getComputedStyle-pseudo.html
>+++ /dev/null
>@@ -1,112 +0,0 @@
>-<!doctype html>
>-<meta charset="utf-8">
>-<title>CSSOM: Correct resolution of resolved value for display-affected pseudo-elements</title>
>-<link rel="help" href="https://drafts.csswg.org/cssom/#dom-window-getcomputedstyle">
>-<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-values">
>-<link rel="author" title="Emilio Cobos Ãlvarez" href="mailto:emilio@crisal.io">
>-<script src=/resources/testharness.js></script>
>-<script src=/resources/testharnessreport.js></script>
>-<style>
>-#test { width: 100px; }
>-
>-#contents {
>-  display: contents;
>-  border: 10px solid red;
>-}
>-
>-#test::before,
>-#test::after,
>-#contents::before,
>-#contents::after,
>-#flex::before,
>-#flex::after {
>-  content: " ";
>-  width: 50%;
>-  height: 10px;
>-  display: block;
>-}
>-#none {
>-  display: none;
>-}
>-#none::before,
>-#none::after {
>-  content: "Foo";
>-}
>-#flex {
>-  display: flex;
>-}
>-#flex-no-pseudo {
>-  display: flex;
>-}
>-#contents-pseudos::before,
>-#contents-pseudos::after {
>-  display: contents;
>-  content: "foo";
>-  position: absolute;
>-}
>-</style>
>-<div id="test">
>-  <div id="contents"></div>
>-  <div id="none"></div>
>-  <div id="flex"></div>
>-  <div id="flex-no-pseudo"></div>
>-  <div id="contents-pseudos"></div>
>-</div>
>-<script>
>-test(function() {
>-  var div = document.getElementById('test');
>-  [":before", ":after"].forEach(function(pseudo) {
>-    assert_equals(getComputedStyle(div, pseudo).width, "50px");
>-  });
>-}, "Resolution of width is correct for ::before and ::after pseudo-elements");
>-test(function() {
>-  var contents = document.getElementById('contents');
>-  [":before", ":after"].forEach(function(pseudo) {
>-    assert_equals(getComputedStyle(contents, pseudo).width, "50px");
>-  });
>-}, "Resolution of width is correct for ::before and ::after pseudo-elements of display: contents elements");
>-test(function() {
>-  var has_no_pseudos = document.body;
>-  has_no_pseudos.style.position = "relative";
>-  [":before", ":after"].forEach(function(pseudo) {
>-    assert_equals(getComputedStyle(has_no_pseudos, pseudo).position, "static",
>-                  "Nonexistent " + pseudo + " pseudo-element shouldn't claim to have " +
>-                  "the same style as the originating element");
>-    assert_equals(getComputedStyle(has_no_pseudos, pseudo).width, "auto",
>-                  "Nonexistent " + pseudo + " pseudo-element shouldn't claim to have " +
>-                  "definite size");
>-  });
>-}, "Resolution of nonexistent pseudo-element styles");
>-test(function() {
>-  var none = document.getElementById('none');
>-  [":before", ":after"].forEach(function(pseudo) {
>-    assert_equals(getComputedStyle(none, pseudo).content, "\"Foo\"",
>-                  "Pseudo-styles of display: none elements should be correct");
>-  });
>-}, "Resolution of pseudo-element styles in display: none elements");
>-test(function() {
>-  var flex = document.getElementById('flex');
>-  [":before", ":after"].forEach(function(pseudo) {
>-    assert_equals(getComputedStyle(flex, pseudo).display, "block",
>-                  "Pseudo-styles of display: flex elements should get blockified");
>-  });
>-}, "Item-based blockification of pseudo-elements");
>-test(function() {
>-  var flexNoPseudo = document.getElementById('flex-no-pseudo');
>-  [":before", ":after"].forEach(function(pseudo) {
>-    assert_equals(getComputedStyle(flexNoPseudo, pseudo).display, "block",
>-                  "Pseudo-styles of display: flex elements should get blockified");
>-  });
>-}, "Item-based blockification of nonexistent pseudo-elements");
>-test(function() {
>-  var contentsPseudos = document.getElementById('contents-pseudos');
>-  [":before", ":after"].forEach(function(pseudo) {
>-    assert_equals(getComputedStyle(contentsPseudos, pseudo).display, "contents",
>-                  "display: contents in " + pseudo + " should get reflected on CSSOM");
>-    assert_equals(getComputedStyle(contentsPseudos, pseudo).width, "auto",
>-                  pseudo + " with display: contents should have no box");
>-    assert_equals(getComputedStyle(contentsPseudos, pseudo).position, "absolute",
>-                  "display: contents in " + pseudo + " should reflect other non-inherited properties in CSSOM");
>-  });
>-}, "display: contents on pseudo-elements");
>-</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/historical-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/historical-expected.txt
>deleted file mode 100644
>index f4341dea16ad0477ac703201003c8e04591742fe..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/historical-expected.txt
>+++ /dev/null
>@@ -1,13 +0,0 @@
>-
>-PASS Historical Document member: selectedStyleSheetSet 
>-PASS Historical Document member: lastStyleSheetSet 
>-PASS Historical Document member: preferredStyleSheetSet 
>-PASS Historical Document member: styleSheetSets 
>-PASS Historical Document member: enableStyleSheetsForSet 
>-PASS Historical Document member: selectedStylesheetSet 
>-PASS Historical Document member: preferredStylesheetSet 
>-PASS Historical Element member: cascadedStyle 
>-PASS Historical Element member: defaultStyle 
>-PASS Historical Element member: rawComputedStyle 
>-PASS Historical Element member: usedStyle 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/historical.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/historical.html
>deleted file mode 100644
>index ddd264c891957a91e5ad17cf9acdb414284f73c5..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/historical.html
>+++ /dev/null
>@@ -1,36 +0,0 @@
>-<!DOCTYPE html>
>-<title>Historical features</title>
>-<link rel="help" href="https://drafts.csswg.org/cssom/#changes-from-5-december-2013">
>-<script src="/resources/testharness.js"></script>
>-<script src="/resources/testharnessreport.js"></script>
>-<div id=log></div>
>-<script>
>-[
>-  "selectedStyleSheetSet",
>-  "lastStyleSheetSet",
>-  "preferredStyleSheetSet",
>-  "styleSheetSets",
>-  "enableStyleSheetsForSet",
>-  "selectedStylesheetSet",
>-  "preferredStylesheetSet",
>-].forEach(function(name) {
>-  test(function() {
>-    assert_false(name in document);
>-
>-    var doc = document.implementation.createDocument(null, null, null);
>-    assert_false(name in doc);
>-  }, "Historical Document member: " + name);
>-});
>-
>-[
>-  "cascadedStyle",
>-  "defaultStyle",
>-  "rawComputedStyle",
>-  "usedStyle",
>-].forEach(function(name) {
>-  test(function() {
>-    assert_false(name in document.body);
>-    assert_false(name in document.createElement("test"));
>-  }, "Historical Element member: " + name);
>-});
>-</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/index-001-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/index-001-expected.txt
>deleted file mode 100644
>index f14c059a6ae2a563358f88951143b173e9266043..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/index-001-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-PASS margin_20px_20px 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/index-001.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/index-001.html
>deleted file mode 100644
>index ca53e503297cdb7401c494d4f124ba33eec1eaa2..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/index-001.html
>+++ /dev/null
>@@ -1,28 +0,0 @@
>-<!doctype html>
>-<head>
>-  <title>CSS OM: CSS Values</title>
>-  <link rel="author" title="Divya Manian" href="mailto:manian@adobe.com">
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-values">
>-  <meta name="flags" content="dom">
>-  <meta name="assert" content="The style value should be serialized to margin: 20px;">
>-  <script src="/resources/testharness.js"></script>
>-  <script src="/resources/testharnessreport.js"></script>
>-</head>
>-<body>
>-    <div id="cssomtestElm"></div>
>-    <div id="log"></div>
>-    <script>
>-        var testElm = document.getElementById('cssomtestElm');
>-        // Set the transform
>-        document.getElementById('cssomtestElm').style.margin = "20px 20px 20px 20px";
>-
>-        // Verify that the transform was set as expected
>-        test(function() {assert_equals(
>-            document.getElementById('cssomtestElm').style.cssText, //Actual
>-            "margin: 20px;",  //Expected
>-            "Margin should be serialized as 'margin: 20px;'")}, //Description
>-            "margin_20px_20px"); //name
>-    </script>
>- </body>
>- </html>
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/index-002-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/index-002-expected.txt
>deleted file mode 100644
>index ba0a4e600e87f9853324191b7263f2abe5c28d76..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/index-002-expected.txt
>+++ /dev/null
>@@ -1,21 +0,0 @@
>-
>-PASS border is expected to be border: 1px; 
>-PASS border is expected to be border: 1px solid red; 
>-PASS border is expected to be border: 1px red; 
>-PASS border is expected to be border: red; 
>-PASS border is expected to be border: 1px; (#2) 
>-PASS border is expected to be border-width: 1px 2px 3px 4px; 
>-PASS border is expected to be border-width: 2px 1px 1px; 
>-PASS border is expected to be border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px; border-top-width: 1px !important; 
>-PASS border is expected to be border-width: 1px; border-top-color: red; 
>-PASS border is expected to be border: dotted; 
>-PASS border is expected to be border-width: 1px; 
>-FAIL overflow is expected to be overflow: scroll hidden; assert_equals: expected "overflow: scroll hidden;" but got "overflow-x: scroll; overflow-y: hidden;"
>-PASS overflow is expected to be overflow: scroll; 
>-PASS outline is expected to be outline: blue dotted 2px; 
>-PASS margin is expected to be margin: 1px 2px 3px 4px; 
>-PASS list is expected to be list-style: circle inside; 
>-PASS list is expected to be list-style-type: lower-alpha; 
>-PASS font-family is expected to be font-family: sans-serif; line-height: 2em; font-size: 3em; font-style: italic; font-weight: bold; 
>-PASS padding is expected to be padding: 1px 2px 3px 4px; 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/index-002.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/index-002.html
>deleted file mode 100644
>index 29ec3a90a11a9858bd91c09e6b11a75b02cd21b0..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/index-002.html
>+++ /dev/null
>@@ -1,79 +0,0 @@
>-<!doctype html>
>-<head>
>-  <title>CSS OM: CSS Values</title>
>-  <link rel="author" title="Divya Manian" href="mailto:manian@adobe.com">
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-values">
>-  <meta name="flags" content="dom">
>-  <meta name="assert" content="Testing Serialization of Shorthand Values">
>-  <script src="/resources/testharness.js"></script>
>-  <script src="/resources/testharnessreport.js"></script>
>-</head>
>-<body>
>-    <div id="cssomtestElm"></div>
>-    <div id="log"></div>
>-    <script>
>-    var tests = {
>-      'border': [
>-      ['border: 1px; border-top: 1px;', 'border: 1px;'],
>-      ['border: 1px solid red;', 'border: 1px solid red;'],
>-      ['border: 1px red;', 'border: 1px red;'],
>-      ['border: red;', 'border: red;'],
>-      ['border-top: 1px; border-right: 1px; border-bottom: 1px; border-left: 1px;', 'border: 1px;', ' (#2)'],
>-      ['border-top: 1px; border-right: 2px; border-bottom: 3px; border-left: 4px;', 'border-width: 1px 2px 3px 4px;'],
>-      ['border: 1px; border-top: 2px;', 'border-width: 2px 1px 1px;'],
>-      ['border: 1px; border-top: 1px !important;',
>-      'border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px; border-top-width: 1px !important;'],
>-
>-      ['border: 1px; border-top-color: red;', 'border-width: 1px; border-top-color: red;'],
>-      ['border: solid; border-style: dotted', 'border: dotted;'],
>-      ['border-width: 1px;', 'border-width: 1px;']
>-      ],
>-
>-      'overflow': [
>-        ['overflow-x: scroll; overflow-y: hidden;', 'overflow: scroll hidden;'],
>-        ['overflow-x: scroll; overflow-y: scroll;', 'overflow: scroll;']
>-      ],
>-      'outline': [
>-        ['outline-width: 2px; outline-style: dotted; outline-color: blue;', 'outline: blue dotted 2px;']
>-      ],
>-      'margin': [
>-        ['margin-top: 1px; margin-right: 2px; margin-bottom: 3px; margin-left: 4px;', 'margin: 1px 2px 3px 4px;']
>-      ],
>-      'list': [
>-        ['list-style-type: circle; list-style-position: inside; list-style-image: initial;', 'list-style: circle inside;'],
>-        ['list-style-type: lower-alpha;', 'list-style-type: lower-alpha;']
>-      ],
>-      'font-family': [
>-      ['font-family: sans-serif; line-height: 2em; font-size: 3em; font-style: italic; font-weight: bold;',
>-          'font-family: sans-serif; line-height: 2em; font-size: 3em; font-style: italic; font-weight: bold;']
>-      ],
>-      'padding': [
>-        ['padding-top: 1px; padding-right: 2px; padding-bottom: 3px; padding-left: 4px;', 'padding: 1px 2px 3px 4px;'],
>-      ]
>-    }
>-
>-    var results = {};
>-
>-    var testElm = document.getElementById('cssomtestElm');
>-    for (var test in tests) {
>-      if(tests.hasOwnProperty(test)) {
>-        results[test] = [];
>-        var propertyTests = tests[test];
>-
>-        for (i = 0; i < propertyTests.length; i++) {
>-          document.getElementById('cssomtestElm').setAttribute('style', propertyTests[i][0]);
>-          var titleSuffix = propertyTests[i][2] || "";
>-          results[test].push([
>-            test + ' is expected to be ' + propertyTests[i][1] + titleSuffix,
>-            document.getElementById('cssomtestElm').style.cssText,
>-            propertyTests[i][1]
>-          ]);
>-        }
>-
>-        generate_tests(assert_equals, results[test]);
>-      }
>-    }
>-
>-    </script>
>- </body>
>- </html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/inline-style-001-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/inline-style-001-expected.txt
>deleted file mode 100644
>index 17509c87bdf6b818715e14ab1b428dff10e0031c..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/inline-style-001-expected.txt
>+++ /dev/null
>@@ -1,7 +0,0 @@
>-
>-FAIL CSSStyleDeclaration_accessible assert_own_property: expected property "style" missing
>-FAIL read Can't find variable: declaration
>-FAIL csstext_write Can't find variable: declaration
>-FAIL property_write Can't find variable: declaration
>-FAIL shorthand_properties Can't find variable: declaration
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/inline-style-001.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/inline-style-001.html
>deleted file mode 100644
>index 3a9eebf7e723322aa492eb1eb5f1f07c99460f4d..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/inline-style-001.html
>+++ /dev/null
>@@ -1,100 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>- <head>
>-  <title>CSS Test: Inline CSSStyleDeclaration</title>
>-  <link rel="author" title="Bear Travis" href="mailto:betravis@adobe.com">
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#elementcssinlinestyle">
>-  <meta name="flags" content="dom">
>-  <meta name="assert" content="Inline CSSStyleDeclaration is properly initialized and can be modified through its interface">
>-  <script src="/resources/testharness.js" type="text/javascript"></script>
>-  <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>- </head>
>- <script id="metadata_cache">/*
>-{
>-  "CSSStyleDeclaration_accessible": { "assert": "Can access CSSStyleDeclaration through style property" },
>-  "read": { "assert": "initial property values are correct" },
>-  "csstext_write": {
>-    "assert": ["setting cssText adds new properties",
>-               "setting cssText removes existing properties",
>-               "properties set through cssText are reflected in the computed style"]
>-  },
>-  "property_write": {
>-    "assert": ["setProperty adds new properties",
>-               "properties set through setProperty are reflected in the computed style"]
>-  },
>-  "shorthand_properties": { "assert": "shorthand property is expanded" }
>-}
>-*/</script>
>- <body>
>- <noscript>Test not run - javascript required.</noscript>
>- <div id="log"></div>
>- <div id="test" style="margin-left: 5px;"></div>
>- <script type="text/javascript">
>-    test(function() {
>-        var test = document.getElementById("test");
>-        assert_own_property(test, "style");
>-        assert_readonly(test, "style");
>-        declaration = test.style;
>-    }, "CSSStyleDeclaration_accessible", {
>-        assert: "Can access CSSStyleDeclaration through style property"
>-    });
>-
>-    test(function() {
>-        assert_regexp_match(declaration.cssText, /margin-left: 5px;\s*/);
>-        assert_equals(declaration.getPropertyValue("margin-left"), "5px");
>-    }, "read", {
>-        assert: "initial property values are correct"
>-    });
>-
>-    test(function() {
>-        declaration.cssText = "margin-left: 10px; padding-left: 10px;";
>-        assert_regexp_match(declaration.cssText, /margin-left: 10px;\s+padding-left: 10px;\s+/);
>-        assert_equals(declaration.length, 2);
>-        assert_equals(declaration.item(0), "margin-left");
>-        assert_equals(declaration.item(1), "padding-left");
>-        assert_equals(declaration.getPropertyValue("margin-left"), "10px");
>-        assert_equals(declaration.getPropertyValue("padding-left"), "10px");
>-
>-        var computedStyle = window.getComputedStyle(document.getElementById("test"));
>-        assert_equals(computedStyle.getPropertyValue("margin-left"), "10px");
>-        assert_equals(computedStyle.getPropertyValue("padding-left"), "10px");
>-    }, "csstext_write", {
>-        assert: [ "setting cssText adds new properties",
>-                "setting cssText removes existing properties",
>-                "properties set through cssText are reflected in the computed style"]
>-    });
>-
>-    test(function() {
>-        while(declaration.length > 0)
>-            declaration.removeProperty(declaration.item(0));
>-        declaration.setProperty("margin-left", "15px");
>-        declaration.setProperty("padding-left", "15px");
>-
>-        assert_equals(declaration.length, 2);
>-        assert_equals(declaration.item(0), "margin-left");
>-        assert_equals(declaration.item(1), "padding-left");
>-        assert_equals(declaration.getPropertyValue("margin-left"), "15px");
>-        assert_equals(declaration.getPropertyValue("padding-left"), "15px");
>-
>-        var computedStyle = window.getComputedStyle(document.getElementById("test"));
>-        assert_equals(computedStyle.getPropertyValue("margin-left"), "15px");
>-        assert_equals(computedStyle.getPropertyValue("padding-left"), "15px");
>-    }, "property_write", {
>-        assert: [ "setProperty adds new properties",
>-                "properties set through setProperty are reflected in the computed style"]
>-    });
>-
>-    test(function() {
>-        while(declaration.length > 0)
>-            declaration.removeProperty(declaration.item(0));
>-        declaration.cssText = "margin: 20px";
>-        assert_equals(declaration.getPropertyValue("margin-top"), "20px");
>-        assert_equals(declaration.getPropertyValue("margin-right"), "20px");
>-        assert_equals(declaration.getPropertyValue("margin-bottom"), "20px");
>-        assert_equals(declaration.getPropertyValue("margin-left"), "20px");
>-    }, "shorthand_properties", {
>-        assert: "shorthand property is expanded"
>-    });
>- </script>
>- </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-charset-no-index-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-charset-no-index-expected.txt
>deleted file mode 100644
>index c418eec7be3c481edd22a5086a723e274789f1a2..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-charset-no-index-expected.txt
>+++ /dev/null
>@@ -1,4 +0,0 @@
>-
>-PASS inserRule with charset and omitted index argument 
>-PASS insertRule with charset and undefined index argument 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-charset-no-index.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-charset-no-index.html
>deleted file mode 100644
>index b94dc11afae7c4d724415ca182c0f1136be74895..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-charset-no-index.html
>+++ /dev/null
>@@ -1,32 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-<head>
>-    <title>CSS Test: CSSOM StyleSheet insertRule with charset and omitted second argument</title>
>-    <link rel="author" title="Sendil Kumar N" href="mailto:sendilkumarn.opensource@gmail.com">
>-    <link rel="help" href="https://drafts.csswg.org/cssom/">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>-    <meta name="flags" content="dom">
>-    <script src="/resources/testharness.js" type="text/javascript"></script>
>-    <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>-    <link rel="stylesheet" type="text/css" href="support/import-charset.css" id="linkElement" >
>-</head>
>-<body>
>-<div id="log"></div>
>-<script type="text/javascript">
>-    var sheet = document.getElementById("linkElement").sheet;
>-    test(function() {
>-        assert_equals(sheet.cssRules.length, 0);
>-        sheet.insertRule("p { color: green; }");
>-        assert_equals(sheet.cssRules.length, 1);
>-        assert_equals(sheet.cssRules.item(0).cssText, "p { color: green; }");
>-    }, "inserRule with charset and omitted index argument");
>-
>-    test(function() {
>-        assert_equals(sheet.cssRules.length, 1);
>-        sheet.insertRule("p { color: yellow; }", undefined);
>-        assert_equals(sheet.cssRules.length, 2);
>-        assert_equals(sheet.cssRules.item(0).cssText, "p { color: yellow; }");
>-    }, "insertRule with charset and undefined index argument");
>-</script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-import-no-index-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-import-no-index-expected.txt
>deleted file mode 100644
>index 3377dee2642c24a2a1d176550c457e0c88f562e9..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-import-no-index-expected.txt
>+++ /dev/null
>@@ -1,4 +0,0 @@
>-
>-PASS inserRule with import and omitted index argument 
>-PASS insertRule with import and undefined index argument 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-import-no-index.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-import-no-index.html
>deleted file mode 100644
>index c97d3949487026b84c60cf5d3681813f4691a7e2..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-import-no-index.html
>+++ /dev/null
>@@ -1,33 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-<head>
>-    <title>CSS Test: CSSOM StyleSheet insertRule with import and omitted second argument</title>
>-    <link rel="author" title="Sendil Kumar N" href="mailto:sendilkumarn.opensource@gmail.com">
>-    <link rel="help" href="https://drafts.csswg.org/cssom/">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>-    <meta name="flags" content="dom">
>-    <script src="/resources/testharness.js" type="text/javascript"></script>
>-    <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>-    <style id="styleElement">
>-        @import url("support/a-green.css");
>-    </style>
>-</head>
>-<body>
>-<div id="log"></div>
>-<script type="text/javascript">
>-    var sheet = document.getElementById("styleElement").sheet;
>-    test(function() {
>-        assert_equals(sheet.cssRules.length, 1);
>-        assert_throws("HierarchyRequestError", function() { sheet.insertRule("p { color: green; }"); });
>-        assert_equals(sheet.cssRules.length, 1);
>-    }, "inserRule with import and omitted index argument");
>-
>-    test(function() {
>-        assert_equals(sheet.cssRules.length, 1);
>-        assert_throws("HierarchyRequestError", function() { sheet.insertRule("p { color: yellow; }", undefined); });
>-        assert_equals(sheet.cssRules.length, 1);
>-        assert_equals(sheet.cssRules.item(0).cssText, "@import url(\"support/a-green.css\");");
>-    }, "insertRule with import and undefined index argument");
>-</script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-namespace-no-index-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-namespace-no-index-expected.txt
>deleted file mode 100644
>index b91fb4e5de93502265928af03684e9d3eb422808..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-namespace-no-index-expected.txt
>+++ /dev/null
>@@ -1,5 +0,0 @@
>-
>-PASS inserRule with namespace and omitted index argument 
>-PASS insertRule with namespace and undefined index argument 
>-PASS inserRule with namespace and omitted index argument should insert import 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-namespace-no-index.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-namespace-no-index.html
>deleted file mode 100644
>index 8a3315d860611db3da89054e02dad9e0f4674dd2..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-namespace-no-index.html
>+++ /dev/null
>@@ -1,40 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-<head>
>-    <title>CSS Test: CSSOM StyleSheet insertRule with namespace and omitted second argument</title>
>-    <link rel="author" title="Sendil Kumar N" href="mailto:sendilkumarn.opensource@gmail.com">
>-    <link rel="help" href="https://drafts.csswg.org/cssom/">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>-    <meta name="flags" content="dom">
>-    <script src="/resources/testharness.js" type="text/javascript"></script>
>-    <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>-    <style id="styleElement">
>-        @namespace svg url(http://servo);
>-        @namespace url(http://servo1);
>-        @namespace svg url("http://servo2");
>-    </style>
>-</head>
>-<body>
>-<div id="log"></div>
>-<script type="text/javascript">
>-    var sheet = document.getElementById("styleElement").sheet;
>-    test(function() {
>-        assert_equals(sheet.cssRules.length, 3);
>-        assert_throws("HierarchyRequestError", function() { sheet.insertRule("p { color: green; }"); });
>-        assert_equals(sheet.cssRules.length, 3);
>-    }, "inserRule with namespace and omitted index argument");
>-
>-    test(function() {
>-        assert_equals(sheet.cssRules.length, 3);
>-        assert_throws("HierarchyRequestError", function() { sheet.insertRule("p { color: yellow; }", undefined); });
>-        assert_equals(sheet.cssRules.length, 3);
>-    }, "insertRule with namespace and undefined index argument");
>-
>-    test(function() {
>-        assert_equals(sheet.cssRules.length, 3);
>-        sheet.insertRule("@import url(\"support/a-green.css\");");
>-        assert_equals(sheet.cssRules.length, 4);
>-    }, "inserRule with namespace and omitted index argument should insert import");
>-</script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-no-index-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-no-index-expected.txt
>deleted file mode 100644
>index b4107613a781629675dd60204b25acecb5044664..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-no-index-expected.txt
>+++ /dev/null
>@@ -1,4 +0,0 @@
>-
>-PASS inserRule with omitted index argument 
>-PASS insertRule with undefined index argument 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-no-index.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-no-index.html
>deleted file mode 100644
>index c9704b7475a5fe2b9959e31c547a480928b956d5..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-no-index.html
>+++ /dev/null
>@@ -1,35 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-<head>
>-    <title>CSS Test: CSSOM StyleSheet insertRule omitted second argument</title>
>-    <link rel="author" title="Sendil Kumar N" href="mailto:sendilkumarn.opensource@gmail.com">
>-    <link rel="help" href="https://drafts.csswg.org/cssom/">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>-    <meta name="flags" content="dom">
>-    <script src="/resources/testharness.js" type="text/javascript"></script>
>-    <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>-    <style id="styleElement">
>-        /* An initial style rule to test where the new rule is inserted relative to this one */
>-        nosuchelement { color: red; }
>-    </style>
>-</head>
>-<body>
>-<div id="log"></div>
>-<script type="text/javascript">
>-    var sheet = document.getElementById("styleElement").sheet;
>-    test(function() {
>-        assert_equals(sheet.cssRules.length, 1);
>-        sheet.insertRule("p { color: green; }");
>-        assert_equals(sheet.cssRules.length, 2);
>-        assert_equals(sheet.cssRules.item(0).cssText, "p { color: green; }");
>-    }, "inserRule with omitted index argument");
>-
>-    test(function() {
>-        assert_equals(sheet.cssRules.length, 2);
>-        sheet.insertRule("p { color: yellow; }", undefined);
>-        assert_equals(sheet.cssRules.length, 3);
>-        assert_equals(sheet.cssRules.item(0).cssText, "p { color: yellow; }");
>-    }, "insertRule with undefined index argument");
>-</script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/interfaces-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/interfaces-expected.txt
>deleted file mode 100644
>index f78c8c728bfa80cbf8f0bfb3304eda6c02d0b70a..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/interfaces-expected.txt
>+++ /dev/null
>@@ -1,481 +0,0 @@
>-CONSOLE MESSAGE: line 331: callback not yet supported
>-CONSOLE MESSAGE: line 331: callback not yet supported
>-CONSOLE MESSAGE: line 331: callback not yet supported
>-CONSOLE MESSAGE: line 331: callback not yet supported
>-CONSOLE MESSAGE: line 331: callback not yet supported
>-CONSOLE MESSAGE: line 331: callback not yet supported
>-CONSOLE MESSAGE: line 331: callback not yet supported
>-CSSOM IDL tests
>-
>-
>-PASS Test driver 
>-PASS HTMLElement interface: attribute style 
>-PASS Unscopable handled correctly for style property on HTMLElement 
>-PASS HTMLElement interface: style_element must inherit property "style" with the proper type 
>-PASS HTMLElement interface: document.createElement('unknownelement') must inherit property "style" with the proper type 
>-PASS HTMLLinkElement interface: attribute sheet 
>-PASS Unscopable handled correctly for sheet property on HTMLLinkElement 
>-PASS HTMLStyleElement interface: attribute sheet 
>-PASS Unscopable handled correctly for sheet property on HTMLStyleElement 
>-PASS Window interface: operation getComputedStyle(Element, CSSOMString) 
>-PASS Unscopable handled correctly for getComputedStyle(Element, CSSOMString) on Window 
>-PASS Window interface: window must inherit property "getComputedStyle(Element, CSSOMString)" with the proper type 
>-PASS Window interface: calling getComputedStyle(Element, CSSOMString) on window with too few arguments must throw TypeError 
>-PASS WorkerGlobalScope interface: existence and properties of interface object 
>-PASS DedicatedWorkerGlobalScope interface: existence and properties of interface object 
>-PASS SharedWorkerGlobalScope interface: existence and properties of interface object 
>-PASS WorkerNavigator interface: existence and properties of interface object 
>-PASS WorkerLocation interface: existence and properties of interface object 
>-PASS Document interface: attribute styleSheets 
>-PASS Unscopable handled correctly for styleSheets property on Document 
>-PASS Document interface: document must inherit property "styleSheets" with the proper type 
>-PASS Document interface: new Document() must inherit property "styleSheets" with the proper type 
>-PASS ProcessingInstruction interface: attribute sheet 
>-PASS Unscopable handled correctly for sheet property on ProcessingInstruction 
>-PASS ProcessingInstruction interface: xmlss_pi must inherit property "sheet" with the proper type 
>-PASS SVGElement interface: attribute style 
>-PASS Unscopable handled correctly for style property on SVGElement 
>-PASS SVGElement interface: svg_element must inherit property "style" with the proper type 
>-PASS MediaList interface: existence and properties of interface object 
>-PASS MediaList interface object length 
>-PASS MediaList interface object name 
>-FAIL MediaList interface: existence and properties of interface prototype object assert_equals: prototype of MediaList.prototype is not Array.prototype expected [] but got object "[object Object]"
>-PASS MediaList interface: existence and properties of interface prototype object's "constructor" property 
>-PASS MediaList interface: existence and properties of interface prototype object's @@unscopables property 
>-PASS MediaList interface: attribute mediaText 
>-PASS Unscopable handled correctly for mediaText property on MediaList 
>-FAIL MediaList interface: stringifier assert_own_property: interface prototype object missing non-static operation expected property "toString" missing
>-PASS MediaList interface: attribute length 
>-PASS Unscopable handled correctly for length property on MediaList 
>-PASS MediaList interface: operation item(unsigned long) 
>-PASS Unscopable handled correctly for item(unsigned long) on MediaList 
>-PASS MediaList interface: operation appendMedium(CSSOMString) 
>-PASS Unscopable handled correctly for appendMedium(CSSOMString) on MediaList 
>-PASS MediaList interface: operation deleteMedium(CSSOMString) 
>-PASS Unscopable handled correctly for deleteMedium(CSSOMString) on MediaList 
>-PASS MediaList must be primary interface of style_element.sheet.media 
>-PASS Stringification of style_element.sheet.media 
>-PASS MediaList interface: style_element.sheet.media must inherit property "mediaText" with the proper type 
>-PASS MediaList interface: style_element.sheet.media must inherit property "length" with the proper type 
>-PASS MediaList interface: style_element.sheet.media must inherit property "item(unsigned long)" with the proper type 
>-PASS MediaList interface: calling item(unsigned long) on style_element.sheet.media with too few arguments must throw TypeError 
>-PASS MediaList interface: style_element.sheet.media must inherit property "appendMedium(CSSOMString)" with the proper type 
>-PASS MediaList interface: calling appendMedium(CSSOMString) on style_element.sheet.media with too few arguments must throw TypeError 
>-PASS MediaList interface: style_element.sheet.media must inherit property "deleteMedium(CSSOMString)" with the proper type 
>-PASS MediaList interface: calling deleteMedium(CSSOMString) on style_element.sheet.media with too few arguments must throw TypeError 
>-PASS StyleSheet interface: existence and properties of interface object 
>-PASS StyleSheet interface object length 
>-PASS StyleSheet interface object name 
>-PASS StyleSheet interface: existence and properties of interface prototype object 
>-PASS StyleSheet interface: existence and properties of interface prototype object's "constructor" property 
>-PASS StyleSheet interface: existence and properties of interface prototype object's @@unscopables property 
>-PASS StyleSheet interface: attribute type 
>-PASS Unscopable handled correctly for type property on StyleSheet 
>-PASS StyleSheet interface: attribute href 
>-PASS Unscopable handled correctly for href property on StyleSheet 
>-PASS StyleSheet interface: attribute ownerNode 
>-PASS Unscopable handled correctly for ownerNode property on StyleSheet 
>-PASS StyleSheet interface: attribute parentStyleSheet 
>-PASS Unscopable handled correctly for parentStyleSheet property on StyleSheet 
>-PASS StyleSheet interface: attribute title 
>-PASS Unscopable handled correctly for title property on StyleSheet 
>-FAIL StyleSheet interface: attribute media assert_equals: setter must be function for PutForwards, Replaceable, or non-readonly attributes expected "function" but got "undefined"
>-PASS Unscopable handled correctly for media property on StyleSheet 
>-PASS StyleSheet interface: attribute disabled 
>-PASS Unscopable handled correctly for disabled property on StyleSheet 
>-PASS CSSStyleSheet interface: existence and properties of interface object 
>-PASS CSSStyleSheet interface object length 
>-PASS CSSStyleSheet interface object name 
>-PASS CSSStyleSheet interface: existence and properties of interface prototype object 
>-PASS CSSStyleSheet interface: existence and properties of interface prototype object's "constructor" property 
>-PASS CSSStyleSheet interface: existence and properties of interface prototype object's @@unscopables property 
>-PASS CSSStyleSheet interface: attribute ownerRule 
>-PASS Unscopable handled correctly for ownerRule property on CSSStyleSheet 
>-PASS CSSStyleSheet interface: attribute cssRules 
>-PASS Unscopable handled correctly for cssRules property on CSSStyleSheet 
>-PASS CSSStyleSheet interface: operation insertRule(CSSOMString, unsigned long) 
>-PASS Unscopable handled correctly for insertRule(CSSOMString, unsigned long) on CSSStyleSheet 
>-PASS CSSStyleSheet interface: operation deleteRule(unsigned long) 
>-PASS Unscopable handled correctly for deleteRule(unsigned long) on CSSStyleSheet 
>-PASS CSSStyleSheet must be primary interface of style_element.sheet 
>-PASS Stringification of style_element.sheet 
>-PASS CSSStyleSheet interface: style_element.sheet must inherit property "ownerRule" with the proper type 
>-PASS CSSStyleSheet interface: style_element.sheet must inherit property "cssRules" with the proper type 
>-PASS CSSStyleSheet interface: style_element.sheet must inherit property "insertRule(CSSOMString, unsigned long)" with the proper type 
>-PASS CSSStyleSheet interface: calling insertRule(CSSOMString, unsigned long) on style_element.sheet with too few arguments must throw TypeError 
>-PASS CSSStyleSheet interface: style_element.sheet must inherit property "deleteRule(unsigned long)" with the proper type 
>-PASS CSSStyleSheet interface: calling deleteRule(unsigned long) on style_element.sheet with too few arguments must throw TypeError 
>-PASS StyleSheet interface: style_element.sheet must inherit property "type" with the proper type 
>-PASS StyleSheet interface: style_element.sheet must inherit property "href" with the proper type 
>-PASS StyleSheet interface: style_element.sheet must inherit property "ownerNode" with the proper type 
>-PASS StyleSheet interface: style_element.sheet must inherit property "parentStyleSheet" with the proper type 
>-PASS StyleSheet interface: style_element.sheet must inherit property "title" with the proper type 
>-PASS StyleSheet interface: style_element.sheet must inherit property "media" with the proper type 
>-PASS StyleSheet interface: style_element.sheet must inherit property "disabled" with the proper type 
>-PASS StyleSheetList interface: existence and properties of interface object 
>-PASS StyleSheetList interface object length 
>-PASS StyleSheetList interface object name 
>-FAIL StyleSheetList interface: existence and properties of interface prototype object assert_equals: prototype of StyleSheetList.prototype is not Array.prototype expected [] but got object "[object Object]"
>-PASS StyleSheetList interface: existence and properties of interface prototype object's "constructor" property 
>-PASS StyleSheetList interface: existence and properties of interface prototype object's @@unscopables property 
>-PASS StyleSheetList interface: operation item(unsigned long) 
>-PASS Unscopable handled correctly for item(unsigned long) on StyleSheetList 
>-PASS StyleSheetList interface: attribute length 
>-PASS Unscopable handled correctly for length property on StyleSheetList 
>-PASS StyleSheetList must be primary interface of document.styleSheets 
>-PASS Stringification of document.styleSheets 
>-PASS StyleSheetList interface: document.styleSheets must inherit property "item(unsigned long)" with the proper type 
>-PASS StyleSheetList interface: calling item(unsigned long) on document.styleSheets with too few arguments must throw TypeError 
>-PASS StyleSheetList interface: document.styleSheets must inherit property "length" with the proper type 
>-PASS CSSRuleList interface: existence and properties of interface object 
>-PASS CSSRuleList interface object length 
>-PASS CSSRuleList interface object name 
>-FAIL CSSRuleList interface: existence and properties of interface prototype object assert_equals: prototype of CSSRuleList.prototype is not Array.prototype expected [] but got object "[object Object]"
>-PASS CSSRuleList interface: existence and properties of interface prototype object's "constructor" property 
>-PASS CSSRuleList interface: existence and properties of interface prototype object's @@unscopables property 
>-PASS CSSRuleList interface: operation item(unsigned long) 
>-PASS Unscopable handled correctly for item(unsigned long) on CSSRuleList 
>-PASS CSSRuleList interface: attribute length 
>-PASS Unscopable handled correctly for length property on CSSRuleList 
>-PASS CSSRuleList must be primary interface of style_element.sheet.cssRules 
>-PASS Stringification of style_element.sheet.cssRules 
>-PASS CSSRuleList interface: style_element.sheet.cssRules must inherit property "item(unsigned long)" with the proper type 
>-PASS CSSRuleList interface: calling item(unsigned long) on style_element.sheet.cssRules with too few arguments must throw TypeError 
>-PASS CSSRuleList interface: style_element.sheet.cssRules must inherit property "length" with the proper type 
>-PASS CSSRule interface: existence and properties of interface object 
>-PASS CSSRule interface object length 
>-PASS CSSRule interface object name 
>-PASS CSSRule interface: existence and properties of interface prototype object 
>-PASS CSSRule interface: existence and properties of interface prototype object's "constructor" property 
>-PASS CSSRule interface: existence and properties of interface prototype object's @@unscopables property 
>-PASS CSSRule interface: constant STYLE_RULE on interface object 
>-PASS CSSRule interface: constant STYLE_RULE on interface prototype object 
>-PASS CSSRule interface: constant CHARSET_RULE on interface object 
>-PASS CSSRule interface: constant CHARSET_RULE on interface prototype object 
>-PASS CSSRule interface: constant IMPORT_RULE on interface object 
>-PASS CSSRule interface: constant IMPORT_RULE on interface prototype object 
>-PASS CSSRule interface: constant MEDIA_RULE on interface object 
>-PASS CSSRule interface: constant MEDIA_RULE on interface prototype object 
>-PASS CSSRule interface: constant FONT_FACE_RULE on interface object 
>-PASS CSSRule interface: constant FONT_FACE_RULE on interface prototype object 
>-PASS CSSRule interface: constant PAGE_RULE on interface object 
>-PASS CSSRule interface: constant PAGE_RULE on interface prototype object 
>-FAIL CSSRule interface: constant MARGIN_RULE on interface object assert_own_property: expected property "MARGIN_RULE" missing
>-FAIL CSSRule interface: constant MARGIN_RULE on interface prototype object assert_own_property: expected property "MARGIN_RULE" missing
>-PASS CSSRule interface: constant NAMESPACE_RULE on interface object 
>-PASS CSSRule interface: constant NAMESPACE_RULE on interface prototype object 
>-PASS CSSRule interface: attribute type 
>-PASS Unscopable handled correctly for type property on CSSRule 
>-PASS CSSRule interface: attribute cssText 
>-PASS Unscopable handled correctly for cssText property on CSSRule 
>-PASS CSSRule interface: attribute parentRule 
>-PASS Unscopable handled correctly for parentRule property on CSSRule 
>-PASS CSSRule interface: attribute parentStyleSheet 
>-PASS Unscopable handled correctly for parentStyleSheet property on CSSRule 
>-PASS CSSStyleRule interface: existence and properties of interface object 
>-PASS CSSStyleRule interface object length 
>-PASS CSSStyleRule interface object name 
>-PASS CSSStyleRule interface: existence and properties of interface prototype object 
>-PASS CSSStyleRule interface: existence and properties of interface prototype object's "constructor" property 
>-PASS CSSStyleRule interface: existence and properties of interface prototype object's @@unscopables property 
>-PASS CSSStyleRule interface: attribute selectorText 
>-PASS Unscopable handled correctly for selectorText property on CSSStyleRule 
>-PASS CSSStyleRule interface: attribute style 
>-PASS Unscopable handled correctly for style property on CSSStyleRule 
>-PASS CSSStyleRule must be primary interface of style_element.sheet.cssRules[4] 
>-PASS Stringification of style_element.sheet.cssRules[4] 
>-PASS CSSStyleRule interface: style_element.sheet.cssRules[4] must inherit property "selectorText" with the proper type 
>-PASS CSSStyleRule interface: style_element.sheet.cssRules[4] must inherit property "style" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[4] must inherit property "STYLE_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[4] must inherit property "CHARSET_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[4] must inherit property "IMPORT_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[4] must inherit property "MEDIA_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[4] must inherit property "FONT_FACE_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[4] must inherit property "PAGE_RULE" with the proper type 
>-FAIL CSSRule interface: style_element.sheet.cssRules[4] must inherit property "MARGIN_RULE" with the proper type assert_inherits: property "MARGIN_RULE" not found in prototype chain
>-PASS CSSRule interface: style_element.sheet.cssRules[4] must inherit property "NAMESPACE_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[4] must inherit property "type" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[4] must inherit property "cssText" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[4] must inherit property "parentRule" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[4] must inherit property "parentStyleSheet" with the proper type 
>-PASS CSSImportRule interface: existence and properties of interface object 
>-PASS CSSImportRule interface object length 
>-PASS CSSImportRule interface object name 
>-PASS CSSImportRule interface: existence and properties of interface prototype object 
>-PASS CSSImportRule interface: existence and properties of interface prototype object's "constructor" property 
>-PASS CSSImportRule interface: existence and properties of interface prototype object's @@unscopables property 
>-PASS CSSImportRule interface: attribute href 
>-PASS Unscopable handled correctly for href property on CSSImportRule 
>-FAIL CSSImportRule interface: attribute media assert_equals: setter must be function for PutForwards, Replaceable, or non-readonly attributes expected "function" but got "undefined"
>-PASS Unscopable handled correctly for media property on CSSImportRule 
>-PASS CSSImportRule interface: attribute styleSheet 
>-PASS Unscopable handled correctly for styleSheet property on CSSImportRule 
>-PASS CSSImportRule must be primary interface of style_element.sheet.cssRules[0] 
>-PASS Stringification of style_element.sheet.cssRules[0] 
>-PASS CSSImportRule interface: style_element.sheet.cssRules[0] must inherit property "href" with the proper type 
>-PASS CSSImportRule interface: style_element.sheet.cssRules[0] must inherit property "media" with the proper type 
>-PASS CSSImportRule interface: style_element.sheet.cssRules[0] must inherit property "styleSheet" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[0] must inherit property "STYLE_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[0] must inherit property "CHARSET_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[0] must inherit property "IMPORT_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[0] must inherit property "MEDIA_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[0] must inherit property "FONT_FACE_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[0] must inherit property "PAGE_RULE" with the proper type 
>-FAIL CSSRule interface: style_element.sheet.cssRules[0] must inherit property "MARGIN_RULE" with the proper type assert_inherits: property "MARGIN_RULE" not found in prototype chain
>-PASS CSSRule interface: style_element.sheet.cssRules[0] must inherit property "NAMESPACE_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[0] must inherit property "type" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[0] must inherit property "cssText" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[0] must inherit property "parentRule" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[0] must inherit property "parentStyleSheet" with the proper type 
>-FAIL CSSGroupingRule interface: existence and properties of interface object assert_own_property: self does not have own property "CSSGroupingRule" expected property "CSSGroupingRule" missing
>-FAIL CSSGroupingRule interface object length assert_own_property: self does not have own property "CSSGroupingRule" expected property "CSSGroupingRule" missing
>-FAIL CSSGroupingRule interface object name assert_own_property: self does not have own property "CSSGroupingRule" expected property "CSSGroupingRule" missing
>-FAIL CSSGroupingRule interface: existence and properties of interface prototype object assert_own_property: self does not have own property "CSSGroupingRule" expected property "CSSGroupingRule" missing
>-FAIL CSSGroupingRule interface: existence and properties of interface prototype object's "constructor" property assert_own_property: self does not have own property "CSSGroupingRule" expected property "CSSGroupingRule" missing
>-FAIL CSSGroupingRule interface: existence and properties of interface prototype object's @@unscopables property assert_own_property: self does not have own property "CSSGroupingRule" expected property "CSSGroupingRule" missing
>-FAIL CSSGroupingRule interface: attribute cssRules assert_own_property: self does not have own property "CSSGroupingRule" expected property "CSSGroupingRule" missing
>-PASS Unscopable handled correctly for cssRules property on CSSGroupingRule 
>-FAIL CSSGroupingRule interface: operation insertRule(CSSOMString, unsigned long) assert_own_property: self does not have own property "CSSGroupingRule" expected property "CSSGroupingRule" missing
>-PASS Unscopable handled correctly for insertRule(CSSOMString, unsigned long) on CSSGroupingRule 
>-FAIL CSSGroupingRule interface: operation deleteRule(unsigned long) assert_own_property: self does not have own property "CSSGroupingRule" expected property "CSSGroupingRule" missing
>-PASS Unscopable handled correctly for deleteRule(unsigned long) on CSSGroupingRule 
>-FAIL CSSPageRule interface: existence and properties of interface object assert_own_property: should inherit from CSSGroupingRule, but self has no such property expected property "CSSGroupingRule" missing
>-PASS CSSPageRule interface object length 
>-PASS CSSPageRule interface object name 
>-FAIL CSSPageRule interface: existence and properties of interface prototype object assert_own_property: should inherit from CSSGroupingRule, but self has no such property expected property "CSSGroupingRule" missing
>-PASS CSSPageRule interface: existence and properties of interface prototype object's "constructor" property 
>-PASS CSSPageRule interface: existence and properties of interface prototype object's @@unscopables property 
>-PASS CSSPageRule interface: attribute selectorText 
>-PASS Unscopable handled correctly for selectorText property on CSSPageRule 
>-PASS CSSPageRule interface: attribute style 
>-PASS Unscopable handled correctly for style property on CSSPageRule 
>-PASS CSSPageRule must be primary interface of style_element.sheet.cssRules[2] 
>-PASS Stringification of style_element.sheet.cssRules[2] 
>-PASS CSSPageRule interface: style_element.sheet.cssRules[2] must inherit property "selectorText" with the proper type 
>-PASS CSSPageRule interface: style_element.sheet.cssRules[2] must inherit property "style" with the proper type 
>-FAIL CSSGroupingRule interface: style_element.sheet.cssRules[2] must inherit property "cssRules" with the proper type assert_inherits: property "cssRules" not found in prototype chain
>-FAIL CSSGroupingRule interface: style_element.sheet.cssRules[2] must inherit property "insertRule(CSSOMString, unsigned long)" with the proper type assert_inherits: property "insertRule" not found in prototype chain
>-FAIL CSSGroupingRule interface: calling insertRule(CSSOMString, unsigned long) on style_element.sheet.cssRules[2] with too few arguments must throw TypeError assert_inherits: property "insertRule" not found in prototype chain
>-FAIL CSSGroupingRule interface: style_element.sheet.cssRules[2] must inherit property "deleteRule(unsigned long)" with the proper type assert_inherits: property "deleteRule" not found in prototype chain
>-FAIL CSSGroupingRule interface: calling deleteRule(unsigned long) on style_element.sheet.cssRules[2] with too few arguments must throw TypeError assert_inherits: property "deleteRule" not found in prototype chain
>-PASS CSSRule interface: style_element.sheet.cssRules[2] must inherit property "STYLE_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[2] must inherit property "CHARSET_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[2] must inherit property "IMPORT_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[2] must inherit property "MEDIA_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[2] must inherit property "FONT_FACE_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[2] must inherit property "PAGE_RULE" with the proper type 
>-FAIL CSSRule interface: style_element.sheet.cssRules[2] must inherit property "MARGIN_RULE" with the proper type assert_inherits: property "MARGIN_RULE" not found in prototype chain
>-PASS CSSRule interface: style_element.sheet.cssRules[2] must inherit property "NAMESPACE_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[2] must inherit property "type" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[2] must inherit property "cssText" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[2] must inherit property "parentRule" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[2] must inherit property "parentStyleSheet" with the proper type 
>-FAIL CSSMarginRule interface: existence and properties of interface object assert_own_property: self does not have own property "CSSMarginRule" expected property "CSSMarginRule" missing
>-FAIL CSSMarginRule interface object length assert_own_property: self does not have own property "CSSMarginRule" expected property "CSSMarginRule" missing
>-FAIL CSSMarginRule interface object name assert_own_property: self does not have own property "CSSMarginRule" expected property "CSSMarginRule" missing
>-FAIL CSSMarginRule interface: existence and properties of interface prototype object assert_own_property: self does not have own property "CSSMarginRule" expected property "CSSMarginRule" missing
>-FAIL CSSMarginRule interface: existence and properties of interface prototype object's "constructor" property assert_own_property: self does not have own property "CSSMarginRule" expected property "CSSMarginRule" missing
>-FAIL CSSMarginRule interface: existence and properties of interface prototype object's @@unscopables property assert_own_property: self does not have own property "CSSMarginRule" expected property "CSSMarginRule" missing
>-FAIL CSSMarginRule interface: attribute name assert_own_property: self does not have own property "CSSMarginRule" expected property "CSSMarginRule" missing
>-PASS Unscopable handled correctly for name property on CSSMarginRule 
>-FAIL CSSMarginRule interface: attribute style assert_own_property: self does not have own property "CSSMarginRule" expected property "CSSMarginRule" missing
>-PASS Unscopable handled correctly for style property on CSSMarginRule 
>-FAIL CSSMarginRule must be primary interface of style_element.sheet.cssRules[2].cssRules[0] assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL Stringification of style_element.sheet.cssRules[2].cssRules[0] assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSMarginRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "name" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSMarginRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "style" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "STYLE_RULE" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "CHARSET_RULE" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "IMPORT_RULE" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "MEDIA_RULE" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "FONT_FACE_RULE" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "PAGE_RULE" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "MARGIN_RULE" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "NAMESPACE_RULE" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "type" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "cssText" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "parentRule" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSRule interface: style_element.sheet.cssRules[2].cssRules[0] must inherit property "parentStyleSheet" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-PASS CSSNamespaceRule interface: existence and properties of interface object 
>-PASS CSSNamespaceRule interface object length 
>-PASS CSSNamespaceRule interface object name 
>-PASS CSSNamespaceRule interface: existence and properties of interface prototype object 
>-PASS CSSNamespaceRule interface: existence and properties of interface prototype object's "constructor" property 
>-PASS CSSNamespaceRule interface: existence and properties of interface prototype object's @@unscopables property 
>-PASS CSSNamespaceRule interface: attribute namespaceURI 
>-PASS Unscopable handled correctly for namespaceURI property on CSSNamespaceRule 
>-PASS CSSNamespaceRule interface: attribute prefix 
>-PASS Unscopable handled correctly for prefix property on CSSNamespaceRule 
>-PASS CSSNamespaceRule must be primary interface of style_element.sheet.cssRules[1] 
>-PASS Stringification of style_element.sheet.cssRules[1] 
>-PASS CSSNamespaceRule interface: style_element.sheet.cssRules[1] must inherit property "namespaceURI" with the proper type 
>-PASS CSSNamespaceRule interface: style_element.sheet.cssRules[1] must inherit property "prefix" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[1] must inherit property "STYLE_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[1] must inherit property "CHARSET_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[1] must inherit property "IMPORT_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[1] must inherit property "MEDIA_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[1] must inherit property "FONT_FACE_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[1] must inherit property "PAGE_RULE" with the proper type 
>-FAIL CSSRule interface: style_element.sheet.cssRules[1] must inherit property "MARGIN_RULE" with the proper type assert_inherits: property "MARGIN_RULE" not found in prototype chain
>-PASS CSSRule interface: style_element.sheet.cssRules[1] must inherit property "NAMESPACE_RULE" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[1] must inherit property "type" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[1] must inherit property "cssText" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[1] must inherit property "parentRule" with the proper type 
>-PASS CSSRule interface: style_element.sheet.cssRules[1] must inherit property "parentStyleSheet" with the proper type 
>-PASS CSSStyleDeclaration interface: existence and properties of interface object 
>-PASS CSSStyleDeclaration interface object length 
>-PASS CSSStyleDeclaration interface object name 
>-PASS CSSStyleDeclaration interface: existence and properties of interface prototype object 
>-PASS CSSStyleDeclaration interface: existence and properties of interface prototype object's "constructor" property 
>-PASS CSSStyleDeclaration interface: existence and properties of interface prototype object's @@unscopables property 
>-PASS CSSStyleDeclaration interface: attribute cssText 
>-PASS Unscopable handled correctly for cssText property on CSSStyleDeclaration 
>-PASS CSSStyleDeclaration interface: attribute length 
>-PASS Unscopable handled correctly for length property on CSSStyleDeclaration 
>-PASS CSSStyleDeclaration interface: operation item(unsigned long) 
>-PASS Unscopable handled correctly for item(unsigned long) on CSSStyleDeclaration 
>-PASS CSSStyleDeclaration interface: operation getPropertyValue(CSSOMString) 
>-PASS Unscopable handled correctly for getPropertyValue(CSSOMString) on CSSStyleDeclaration 
>-PASS CSSStyleDeclaration interface: operation getPropertyPriority(CSSOMString) 
>-PASS Unscopable handled correctly for getPropertyPriority(CSSOMString) on CSSStyleDeclaration 
>-PASS CSSStyleDeclaration interface: operation setProperty(CSSOMString, CSSOMString, CSSOMString) 
>-PASS Unscopable handled correctly for setProperty(CSSOMString, CSSOMString, CSSOMString) on CSSStyleDeclaration 
>-FAIL CSSStyleDeclaration interface: operation setPropertyValue(CSSOMString, CSSOMString) assert_own_property: interface prototype object missing non-static operation expected property "setPropertyValue" missing
>-PASS Unscopable handled correctly for setPropertyValue(CSSOMString, CSSOMString) on CSSStyleDeclaration 
>-FAIL CSSStyleDeclaration interface: operation setPropertyPriority(CSSOMString, CSSOMString) assert_own_property: interface prototype object missing non-static operation expected property "setPropertyPriority" missing
>-PASS Unscopable handled correctly for setPropertyPriority(CSSOMString, CSSOMString) on CSSStyleDeclaration 
>-PASS CSSStyleDeclaration interface: operation removeProperty(CSSOMString) 
>-PASS Unscopable handled correctly for removeProperty(CSSOMString) on CSSStyleDeclaration 
>-PASS CSSStyleDeclaration interface: attribute parentRule 
>-PASS Unscopable handled correctly for parentRule property on CSSStyleDeclaration 
>-PASS CSSStyleDeclaration interface: attribute cssFloat 
>-PASS Unscopable handled correctly for cssFloat property on CSSStyleDeclaration 
>-PASS CSSStyleDeclaration must be primary interface of style_element.sheet.cssRules[4].style 
>-PASS Stringification of style_element.sheet.cssRules[4].style 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[4].style must inherit property "cssText" with the proper type 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[4].style must inherit property "length" with the proper type 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[4].style must inherit property "item(unsigned long)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling item(unsigned long) on style_element.sheet.cssRules[4].style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[4].style must inherit property "getPropertyValue(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling getPropertyValue(CSSOMString) on style_element.sheet.cssRules[4].style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[4].style must inherit property "getPropertyPriority(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling getPropertyPriority(CSSOMString) on style_element.sheet.cssRules[4].style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[4].style must inherit property "setProperty(CSSOMString, CSSOMString, CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling setProperty(CSSOMString, CSSOMString, CSSOMString) on style_element.sheet.cssRules[4].style with too few arguments must throw TypeError 
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[4].style must inherit property "setPropertyValue(CSSOMString, CSSOMString)" with the proper type assert_inherits: property "setPropertyValue" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: calling setPropertyValue(CSSOMString, CSSOMString) on style_element.sheet.cssRules[4].style with too few arguments must throw TypeError assert_inherits: property "setPropertyValue" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[4].style must inherit property "setPropertyPriority(CSSOMString, CSSOMString)" with the proper type assert_inherits: property "setPropertyPriority" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: calling setPropertyPriority(CSSOMString, CSSOMString) on style_element.sheet.cssRules[4].style with too few arguments must throw TypeError assert_inherits: property "setPropertyPriority" not found in prototype chain
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[4].style must inherit property "removeProperty(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling removeProperty(CSSOMString) on style_element.sheet.cssRules[4].style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[4].style must inherit property "parentRule" with the proper type 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[4].style must inherit property "cssFloat" with the proper type 
>-PASS CSSStyleDeclaration must be primary interface of style_element.sheet.cssRules[2].style 
>-PASS Stringification of style_element.sheet.cssRules[2].style 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[2].style must inherit property "cssText" with the proper type 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[2].style must inherit property "length" with the proper type 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[2].style must inherit property "item(unsigned long)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling item(unsigned long) on style_element.sheet.cssRules[2].style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[2].style must inherit property "getPropertyValue(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling getPropertyValue(CSSOMString) on style_element.sheet.cssRules[2].style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[2].style must inherit property "getPropertyPriority(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling getPropertyPriority(CSSOMString) on style_element.sheet.cssRules[2].style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[2].style must inherit property "setProperty(CSSOMString, CSSOMString, CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling setProperty(CSSOMString, CSSOMString, CSSOMString) on style_element.sheet.cssRules[2].style with too few arguments must throw TypeError 
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].style must inherit property "setPropertyValue(CSSOMString, CSSOMString)" with the proper type assert_inherits: property "setPropertyValue" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: calling setPropertyValue(CSSOMString, CSSOMString) on style_element.sheet.cssRules[2].style with too few arguments must throw TypeError assert_inherits: property "setPropertyValue" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].style must inherit property "setPropertyPriority(CSSOMString, CSSOMString)" with the proper type assert_inherits: property "setPropertyPriority" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: calling setPropertyPriority(CSSOMString, CSSOMString) on style_element.sheet.cssRules[2].style with too few arguments must throw TypeError assert_inherits: property "setPropertyPriority" not found in prototype chain
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[2].style must inherit property "removeProperty(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling removeProperty(CSSOMString) on style_element.sheet.cssRules[2].style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[2].style must inherit property "parentRule" with the proper type 
>-PASS CSSStyleDeclaration interface: style_element.sheet.cssRules[2].style must inherit property "cssFloat" with the proper type 
>-FAIL CSSStyleDeclaration must be primary interface of style_element.sheet.cssRules[2].cssRules[0].style assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL Stringification of style_element.sheet.cssRules[2].cssRules[0].style assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].cssRules[0].style must inherit property "cssText" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].cssRules[0].style must inherit property "length" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].cssRules[0].style must inherit property "item(unsigned long)" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: calling item(unsigned long) on style_element.sheet.cssRules[2].cssRules[0].style with too few arguments must throw TypeError assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].cssRules[0].style must inherit property "getPropertyValue(CSSOMString)" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: calling getPropertyValue(CSSOMString) on style_element.sheet.cssRules[2].cssRules[0].style with too few arguments must throw TypeError assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].cssRules[0].style must inherit property "getPropertyPriority(CSSOMString)" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: calling getPropertyPriority(CSSOMString) on style_element.sheet.cssRules[2].cssRules[0].style with too few arguments must throw TypeError assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].cssRules[0].style must inherit property "setProperty(CSSOMString, CSSOMString, CSSOMString)" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: calling setProperty(CSSOMString, CSSOMString, CSSOMString) on style_element.sheet.cssRules[2].cssRules[0].style with too few arguments must throw TypeError assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].cssRules[0].style must inherit property "setPropertyValue(CSSOMString, CSSOMString)" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: calling setPropertyValue(CSSOMString, CSSOMString) on style_element.sheet.cssRules[2].cssRules[0].style with too few arguments must throw TypeError assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].cssRules[0].style must inherit property "setPropertyPriority(CSSOMString, CSSOMString)" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: calling setPropertyPriority(CSSOMString, CSSOMString) on style_element.sheet.cssRules[2].cssRules[0].style with too few arguments must throw TypeError assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].cssRules[0].style must inherit property "removeProperty(CSSOMString)" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: calling removeProperty(CSSOMString) on style_element.sheet.cssRules[2].cssRules[0].style with too few arguments must throw TypeError assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].cssRules[0].style must inherit property "parentRule" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-FAIL CSSStyleDeclaration interface: style_element.sheet.cssRules[2].cssRules[0].style must inherit property "cssFloat" with the proper type assert_equals: Unexpected exception when evaluating object expected null but got object "TypeError: undefined is not an object (evaluating 'style_element.sheet.cssRules[2].cssRules[0]')"
>-PASS CSSStyleDeclaration must be primary interface of style_element.style 
>-PASS Stringification of style_element.style 
>-PASS CSSStyleDeclaration interface: style_element.style must inherit property "cssText" with the proper type 
>-PASS CSSStyleDeclaration interface: style_element.style must inherit property "length" with the proper type 
>-PASS CSSStyleDeclaration interface: style_element.style must inherit property "item(unsigned long)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling item(unsigned long) on style_element.style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: style_element.style must inherit property "getPropertyValue(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling getPropertyValue(CSSOMString) on style_element.style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: style_element.style must inherit property "getPropertyPriority(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling getPropertyPriority(CSSOMString) on style_element.style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: style_element.style must inherit property "setProperty(CSSOMString, CSSOMString, CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling setProperty(CSSOMString, CSSOMString, CSSOMString) on style_element.style with too few arguments must throw TypeError 
>-FAIL CSSStyleDeclaration interface: style_element.style must inherit property "setPropertyValue(CSSOMString, CSSOMString)" with the proper type assert_inherits: property "setPropertyValue" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: calling setPropertyValue(CSSOMString, CSSOMString) on style_element.style with too few arguments must throw TypeError assert_inherits: property "setPropertyValue" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: style_element.style must inherit property "setPropertyPriority(CSSOMString, CSSOMString)" with the proper type assert_inherits: property "setPropertyPriority" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: calling setPropertyPriority(CSSOMString, CSSOMString) on style_element.style with too few arguments must throw TypeError assert_inherits: property "setPropertyPriority" not found in prototype chain
>-PASS CSSStyleDeclaration interface: style_element.style must inherit property "removeProperty(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling removeProperty(CSSOMString) on style_element.style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: style_element.style must inherit property "parentRule" with the proper type 
>-PASS CSSStyleDeclaration interface: style_element.style must inherit property "cssFloat" with the proper type 
>-PASS CSSStyleDeclaration must be primary interface of svg_element.style 
>-PASS Stringification of svg_element.style 
>-PASS CSSStyleDeclaration interface: svg_element.style must inherit property "cssText" with the proper type 
>-PASS CSSStyleDeclaration interface: svg_element.style must inherit property "length" with the proper type 
>-PASS CSSStyleDeclaration interface: svg_element.style must inherit property "item(unsigned long)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling item(unsigned long) on svg_element.style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: svg_element.style must inherit property "getPropertyValue(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling getPropertyValue(CSSOMString) on svg_element.style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: svg_element.style must inherit property "getPropertyPriority(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling getPropertyPriority(CSSOMString) on svg_element.style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: svg_element.style must inherit property "setProperty(CSSOMString, CSSOMString, CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling setProperty(CSSOMString, CSSOMString, CSSOMString) on svg_element.style with too few arguments must throw TypeError 
>-FAIL CSSStyleDeclaration interface: svg_element.style must inherit property "setPropertyValue(CSSOMString, CSSOMString)" with the proper type assert_inherits: property "setPropertyValue" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: calling setPropertyValue(CSSOMString, CSSOMString) on svg_element.style with too few arguments must throw TypeError assert_inherits: property "setPropertyValue" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: svg_element.style must inherit property "setPropertyPriority(CSSOMString, CSSOMString)" with the proper type assert_inherits: property "setPropertyPriority" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: calling setPropertyPriority(CSSOMString, CSSOMString) on svg_element.style with too few arguments must throw TypeError assert_inherits: property "setPropertyPriority" not found in prototype chain
>-PASS CSSStyleDeclaration interface: svg_element.style must inherit property "removeProperty(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling removeProperty(CSSOMString) on svg_element.style with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: svg_element.style must inherit property "parentRule" with the proper type 
>-PASS CSSStyleDeclaration interface: svg_element.style must inherit property "cssFloat" with the proper type 
>-PASS CSSStyleDeclaration must be primary interface of getComputedStyle(svg_element) 
>-PASS Stringification of getComputedStyle(svg_element) 
>-PASS CSSStyleDeclaration interface: getComputedStyle(svg_element) must inherit property "cssText" with the proper type 
>-PASS CSSStyleDeclaration interface: getComputedStyle(svg_element) must inherit property "length" with the proper type 
>-PASS CSSStyleDeclaration interface: getComputedStyle(svg_element) must inherit property "item(unsigned long)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling item(unsigned long) on getComputedStyle(svg_element) with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: getComputedStyle(svg_element) must inherit property "getPropertyValue(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling getPropertyValue(CSSOMString) on getComputedStyle(svg_element) with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: getComputedStyle(svg_element) must inherit property "getPropertyPriority(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling getPropertyPriority(CSSOMString) on getComputedStyle(svg_element) with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: getComputedStyle(svg_element) must inherit property "setProperty(CSSOMString, CSSOMString, CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling setProperty(CSSOMString, CSSOMString, CSSOMString) on getComputedStyle(svg_element) with too few arguments must throw TypeError 
>-FAIL CSSStyleDeclaration interface: getComputedStyle(svg_element) must inherit property "setPropertyValue(CSSOMString, CSSOMString)" with the proper type assert_inherits: property "setPropertyValue" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: calling setPropertyValue(CSSOMString, CSSOMString) on getComputedStyle(svg_element) with too few arguments must throw TypeError assert_inherits: property "setPropertyValue" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: getComputedStyle(svg_element) must inherit property "setPropertyPriority(CSSOMString, CSSOMString)" with the proper type assert_inherits: property "setPropertyPriority" not found in prototype chain
>-FAIL CSSStyleDeclaration interface: calling setPropertyPriority(CSSOMString, CSSOMString) on getComputedStyle(svg_element) with too few arguments must throw TypeError assert_inherits: property "setPropertyPriority" not found in prototype chain
>-PASS CSSStyleDeclaration interface: getComputedStyle(svg_element) must inherit property "removeProperty(CSSOMString)" with the proper type 
>-PASS CSSStyleDeclaration interface: calling removeProperty(CSSOMString) on getComputedStyle(svg_element) with too few arguments must throw TypeError 
>-PASS CSSStyleDeclaration interface: getComputedStyle(svg_element) must inherit property "parentRule" with the proper type 
>-PASS CSSStyleDeclaration interface: getComputedStyle(svg_element) must inherit property "cssFloat" with the proper type 
>-PASS CSS interface: existence and properties of interface object 
>-PASS CSS interface object length 
>-PASS CSS interface object name 
>-PASS CSS interface: existence and properties of interface prototype object 
>-PASS CSS interface: existence and properties of interface prototype object's "constructor" property 
>-PASS CSS interface: existence and properties of interface prototype object's @@unscopables property 
>-PASS CSS interface: operation escape(CSSOMString) 
>-PASS Unscopable handled correctly for escape(CSSOMString) on CSS 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/interfaces.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/interfaces.html
>deleted file mode 100644
>index e6f6bec7ac495241e2aeb27fc09889c445ec9ab6..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/interfaces.html
>+++ /dev/null
>@@ -1,89 +0,0 @@
>-<!doctype html>
>-<meta charset=utf-8>
>-
>-<title>CSSOM automated IDL tests</title>
>-<link rel="author" title="Ms2ger" href="mailto:Ms2ger@gmail.com">
>-<link rel="help" href="https://drafts.csswg.org/cssom-1/#idl-index">
>-<script src=/resources/testharness.js></script>
>-<script src=/resources/testharnessreport.js></script>
>-<script src=/resources/WebIDLParser.js></script>
>-<script src=/resources/idlharness.js></script>
>-
>-<style id="styleElement" style="z-index: 0;">
>-@import url("data:text/css,");
>-@namespace x "y";
>-@page { @top-left {} }
>-@media all {}
>-#test { color: green; }
>-</style>
>-
>-<svg id="svgElement" style="height: 0;"></svg>
>-
>-<iframe id="xmlssPiIframe" src="support/xmlss-pi.xhtml" style="display: none;"></iframe>
>-
>-<h1>CSSOM IDL tests</h1>
>-<div id=log></div>
>-
>-<script>
>-"use strict";
>-var style_element, svg_element, xmlss_pi;
>-
>-function doTest([html, dom, cssom]) {
>-  style_element = document.getElementById('styleElement');
>-  svg_element = document.getElementById('svgElement');
>-  xmlss_pi = document.getElementById('xmlssPiIframe').contentDocument.firstChild;
>-
>-  var idlArray = new IdlArray();
>-  var svg = "interface SVGElement : Element {};";
>-  idlArray.add_untested_idls(html + dom + svg);
>-  idlArray.add_idls(cssom);
>-
>-  idlArray.add_objects({
>-    "Document": ["document", "new Document()"],
>-    "StyleSheetList": ["document.styleSheets"],
>-    "CSSStyleSheet": ["style_element.sheet"],
>-    "MediaList": ["style_element.sheet.media"],
>-    "CSSRuleList": ["style_element.sheet.cssRules"],
>-    "CSSImportRule": ["style_element.sheet.cssRules[0]"],
>-    "CSSNamespaceRule": ["style_element.sheet.cssRules[1]"],
>-    "CSSPageRule": ["style_element.sheet.cssRules[2]"],
>-    "CSSMarginRule": ["style_element.sheet.cssRules[2].cssRules[0]"],
>-    "CSSMediaRule": ["style_element.sheet.cssRules[3]"],
>-    "CSSStyleRule": ["style_element.sheet.cssRules[4]"],
>-    "CSSStyleDeclaration": ["style_element.sheet.cssRules[4].style", // CSSStyleRule
>-                            "style_element.sheet.cssRules[2].style", // CSSPageRule
>-                            "style_element.sheet.cssRules[2].cssRules[0].style", // CSSMarginRule
>-                            "style_element.style", // ElementCSSInlineStyle for HTMLElement
>-                            "svg_element.style", // ElementCSSInlineStyle for SVGElement
>-                            "getComputedStyle(svg_element)"],
>-    "ProcessingInstruction": ["xmlss_pi"],
>-    "Window": ["window"],
>-    "HTMLElement": ["style_element", "document.createElement('unknownelement')"],
>-    "SVGElement": ["svg_element"],
>-  });
>-  idlArray.test();
>-};
>-
>-function fetchData(url) {
>-  return fetch(url).then((response) => response.text());
>-}
>-
>-function waitForLoad() {
>-  return new Promise(function(resolve) {
>-    addEventListener("load", resolve);
>-  });
>-}
>-
>-promise_test(function() {
>-  // Have to wait for onload
>-  return Promise.all([fetchData("/interfaces/html.idl"),
>-                      fetchData("/interfaces/dom.idl"),
>-                      fetchData("/interfaces/cssom.idl"),
>-                      waitForLoad()])
>-                .then(doTest);
>-}, "Test driver");
>-
>-</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-001-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-001-expected.txt
>deleted file mode 100644
>index b35b400b5c0059bd3395b4acd9690b754f33790b..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-001-expected.txt
>+++ /dev/null
>@@ -1,6 +0,0 @@
>-
>-PASS mediatest_medialist_serialize_element 
>-PASS mediatest_medialist_serialize_comma 
>-PASS mediatest_medialist_serialize_empty 
>-FAIL mediatest_medialist_serialize_lexicographical assert_equals: expected "all, print, screen" but got "all, screen, print"
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-001.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-001.html
>deleted file mode 100644
>index ad95394d5c5e992b9235c8241936128ba3043463..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-001.html
>+++ /dev/null
>@@ -1,110 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>- <head>
>-  <title>CSS Test: CSSOM Media Query List Serialization</title>
>-  <link rel="author" title="Ben Sheldon" href="mailto:ben@codeforamerica.org">
>-  <link rel="author" title="Chapman Shoop" href="mailto:chapman.shoop@gmail.com">
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-medialist-interface">
>-  <meta name="flags" content="dom">
>-  <meta name="assert" content="MediaLists are serialized according to the specification">
>-  <script src="/resources/testharness.js" type="text/javascript"></script>
>-  <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>-  <script id="metadata_cache">/*
>-  {
>-    "mediatest_medialist_serialize_element": {
>-      "help": ["http://www.w3.org/TR/cssom-1/#the-medialist-interface",
>-               "http://www.w3.org/TR/cssom-1/#serializing-media-queries"],
>-      "assert": ["MediaList.mediaText equals the 'media' value of the initial 'style' element."]
>-    },
>-    "mediatest_medialist_serialize_comma": {
>-      "help": ["http://www.w3.org/TR/cssom-1/#the-medialist-interface",
>-               "http://www.w3.org/TR/cssom-1/#serializing-media-queries"],
>-      "assert": ["To serialize a comma-separated list concatenate all items of the list in list order while separating them by \",\" (U+002C), followed by a space (U+0020)."]
>-    },
>-    "mediatest_medialist_serialize_empty": {
>-      "help": ["http://www.w3.org/TR/cssom-1/#the-medialist-interface",
>-               "http://www.w3.org/TR/cssom-1/#serializing-media-queries"],
>-      "assert": ["If the media query list is empty return the empty string."]
>-    },
>-    "mediatest_medialist_serialize_lexicographical": {
>-      "help": ["http://www.w3.org/TR/cssom-1/#the-medialist-interface",
>-               "http://www.w3.org/TR/cssom-1/#serializing-media-queries"],
>-      "assert": ["Each media query in the list of media queries should be sorted in lexicographical order."]
>-    }
>-  }
>-  */</script>
>- </head>
>- <body>
>-  <noscript>Test not run - javascript required.</noscript>
>-  <div id="log"></div>
>-  <script type="text/javascript">
>-
>-    var styleElement;
>-    var styleSheet;
>-    var mediaList;
>-
>-    // Setup
>-    function setup() {
>-      styleElement = document.getElementById("styleElement");
>-
>-      if (styleElement) {
>-        // teardown
>-        document.getElementsByTagName("head")[0].removeChild(styleElement);
>-        styleElement = undefined;
>-        styleSheet = undefined;
>-        mediaList = undefined;
>-      }
>-
>-      styleElement = document.createElement("style");
>-      styleElement.id = "styleElement";
>-      styleElement.type = "text/css";
>-      styleElement.media = "all";
>-      document.getElementsByTagName("head")[0].appendChild(styleElement);
>-      styleSheet = styleElement.sheet;
>-      mediaList = styleSheet.media;
>-    }
>-
>-
>-    test(function() {
>-        setup();
>-
>-        assert_equals(mediaList.mediaText, "all");
>-
>-    }, "mediatest_medialist_serialize_element",
>-    { help: ["http://www.w3.org/TR/cssom-1/#the-medialist-interface", "http://www.w3.org/TR/cssom-1/#serializing-media-queries"],
>-      assert: ["MediaList.mediaText equals the 'media' value of the initial 'style' element."] });
>-
>-    test(function() {
>-      setup();
>-
>-      mediaList.appendMedium('screen');
>-      assert_equals(mediaList.mediaText, "all, screen");
>-
>-    }, "mediatest_medialist_serialize_comma",
>-    { help: ["http://www.w3.org/TR/cssom-1/#the-medialist-interface", "http://www.w3.org/TR/cssom-1/#serializing-media-queries"],
>-      assert: ["To serialize a comma-separated list concatenate all items of the list in list order while separating them by \",\" (U+002C), followed by a space (U+0020)."] });
>-
>-    test(function() {
>-      setup();
>-
>-      mediaList.deleteMedium('all');
>-      assert_equals(mediaList.mediaText, "");
>-
>-    }, "mediatest_medialist_serialize_empty",
>-    { help: ["http://www.w3.org/TR/cssom-1/#the-medialist-interface", "http://www.w3.org/TR/cssom-1/#serializing-media-queries"],
>-      assert: ["If the media query list is empty return the empty string."] });
>-
>-    test(function() {
>-      setup();
>-
>-      mediaList.appendMedium('screen');
>-      mediaList.appendMedium('print');
>-      assert_equals(mediaList.mediaText, "all, print, screen");
>-
>-    }, "mediatest_medialist_serialize_lexicographical",
>-    { help: ["http://www.w3.org/TR/cssom-1/#the-medialist-interface", "http://www.w3.org/TR/cssom-1/#serializing-media-queries"],
>-      assert: ["Each media query in the list of media queries should be sorted in lexicographical order."] });
>-
>-  </script>
>- </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-002-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-002-expected.txt
>deleted file mode 100644
>index 85506e305a6c4ffb005f57f6505d884113f3f95b..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-002-expected.txt
>+++ /dev/null
>@@ -1,5 +0,0 @@
>-
>-PASS deleteMedium_called_without_argument 
>-PASS deleteMedium_removes_correct_medium 
>-FAIL deleteMedium_no_matching_medium_to_remove The object can not be found here.
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-002.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-002.html
>deleted file mode 100644
>index 6ed93ad17c0559c0481d0019f31b3d1c8ed7b19d..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-002.html
>+++ /dev/null
>@@ -1,80 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-<head>
>-  <title>CSS Test: CSSOM MediaList Interfaces</title>
>-  <link rel="author" title="Chapman Shoop" href="mailto:chapman.shoop@gmail.com">
>-  <link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> 
>-  <link rel="help" href="https://drafts.csswg.org/cssom/#the-medialist-interface">
>-  <meta name="flags" content="dom">
>-  <meta name="assert" content="MediaList object has deleteMedium method and it functions properly.">
>-  <script src="/resources/testharness.js" type="text/javascript"></script>
>-  <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>-
>-  <script id="metadata_cache">/*
>-  {
>-    "deleteMedium_called_without_argument": { "assert": "MediaList.deleteMedium called without argument throws error." },
>-    "deleteMedium_removes_correct_medium": { "assert": "MediaList.deleteMedium removes correct medium and updates corresponding properties." },
>-    "deleteMedium_no_matching_medium_to_remove": { "assert": "MediaList.deleteMedium doesn't modify MediaList when medium is not found." }
>-  }
>-*/</script>
>-
>-</head>
>-
>-<body>
>-  <noscript>Test not run - javascript required.</noscript>
>-  <div id="log"></div>
>-
>-  <script type="text/javascript">
>-    function setup() {
>-      // Clean out any old style element
>-      var old_style_el = document.getElementById('test_style');
>-      if (old_style_el) {
>-        document.head.removeChild(old_style_el);
>-      }
>-
>-      // Create a fresh style element and return its media attribute
>-      var style_el = document.createElement('style');
>-      style_el.setAttribute('id', 'test_style');
>-      document.head.appendChild(style_el);
>-      return style_el.sheet.media;
>-    }
>-  </script>
>-
>-  <script type="text/javascript">
>-
>-    test(function() {
>-      media_list = setup();
>-      assert_throws(new TypeError, function() { media_list.deleteMedium(); });
>-    }, "deleteMedium_called_without_argument",
>-    { assert: "MediaList.deleteMedium called without argument throws error." });
>-
>-    test(function() {
>-      media_list = setup();
>-
>-      media_list.appendMedium("screen");
>-      media_list.appendMedium("all");
>-
>-      media_list.deleteMedium("screen");
>-
>-      assert_equals(media_list.length, 1);
>-      assert_equals(media_list.item(0), "all");
>-      assert_equals(media_list.mediaText, "all");
>-    }, "deleteMedium_removes_correct_medium",
>-    { assert: "MediaList.deleteMedium removes correct medium and updates corresponding properties." });
>-
>-    test(function() {
>-      media_list = setup();
>-
>-      media_list.appendMedium("all");
>-
>-      media_list.deleteMedium("screen");
>-
>-      assert_equals(media_list.length, 1);
>-      assert_equals(media_list.item(0), "all");
>-      assert_equals(media_list.mediaText, "all");
>-    }, "deleteMedium_no_matching_medium_to_remove",
>-    { assert: "MediaList.deleteMedium doesn't modify MediaList when medium is not found." });
>-
>-  </script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-003-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-003-expected.txt
>deleted file mode 100644
>index 50651628444e3cd07a3685a8d21260ed06055094..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-003-expected.txt
>+++ /dev/null
>@@ -1,4 +0,0 @@
>-
>-PASS mediatest_mediaquery_serialize_1 
>-PASS mediatest_mediaquery_serialize_2 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-003.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-003.html
>deleted file mode 100644
>index 717c39d618feb5b62b0f0bcf80184b6acbd6c53c..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-003.html
>+++ /dev/null
>@@ -1,72 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>- <head>
>-  <title>CSS Test: CSSOM Media Query Serialization</title>
>-  <link rel="author" title="Ben Sheldon" href="mailto:ben@codeforamerica.org">
>-  <link rel="author" title="Chapman Shoop" href="mailto:chapman.shoop@gmail.com">
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#serializing-media-queries">
>-  <meta name="flags" content="dom">
>-  <meta name="assert" content="Media Queries are serialized according to the specification">
>-  <script src="/resources/testharness.js" type="text/javascript"></script>
>-  <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>- </head>
>- <script id="metadata_cache">/*
>- {
>-   "mediatest_mediaquery_serialize_1": {
>-     "assert": ["First explicit example input (first column) and output (second column) in specification."]
>-   },
>-   "mediatest_mediaquery_serialize_2": {
>-     "assert": ["Second explicit example input (first column) and output (second column) in specification."]
>-   }
>- }
>- */</script>
>- <body>
>-  <noscript>Test not run - javascript required.</noscript>
>-  <div id="log"></div>
>-  <script type="text/javascript">
>-
>-    var styleElement;
>-    var styleSheet;
>-    var mediaList;
>-
>-    // Setup - accepts media value for style element, e.g. <style media=???">
>-    function setupMedia(media) {
>-      styleElement = document.getElementById("styleElement");
>-
>-      if (styleElement) {
>-        // teardown
>-        document.getElementsByTagName("head")[0].removeChild(styleElement);
>-        styleElement = undefined;
>-        styleSheet = undefined;
>-        mediaList = undefined;
>-      }
>-
>-      styleElement = document.createElement("style");
>-      styleElement.id = "styleElement";
>-      styleElement.type = "text/css";
>-      styleElement.media = media;
>-      document.getElementsByTagName("head")[0].appendChild(styleElement);
>-      styleSheet = styleElement.sheet;
>-      mediaList = styleSheet.media;
>-    }
>-
>-
>-    test(function() {
>-        setupMedia('not screen and (min-WIDTH:5px) AND (max-width:40px )');
>-
>-        assert_equals(mediaList.mediaText, "not screen and (max-width: 40px) and (min-width: 5px)");
>-
>-    }, "mediatest_mediaquery_serialize_1",
>-    {  assert: ["First explicit example input (first column) and output (second column) in specification."] });
>-
>-    test(function() {
>-        setupMedia('all and (color) and (color)	');
>-
>-        assert_equals(mediaList.mediaText, "(color)");
>-
>-    }, "mediatest_mediaquery_serialize_2",
>-    { assert: ["Second explicit example input (first column) and output (second column) in specification."] });
>-
>-  </script>
>- </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-004-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-004-expected.txt
>deleted file mode 100644
>index 765fd4fbc4113893a8e2c6b02135f8661f3ba5fb..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-004-expected.txt
>+++ /dev/null
>@@ -1,4 +0,0 @@
>-
>-PASS appendMedium_correctly_appends_medium_to_empty_MediaList 
>-FAIL appendMedium_correctly_appends_medium_to_nonempty_MediaList assert_equals: expected "all, screen" but got "screen, all"
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-004.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-004.html
>deleted file mode 100644
>index 2fe6ff915d746d24619b04545c460f50278da44c..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-004.html
>+++ /dev/null
>@@ -1,72 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-<head>
>-  <title>CSS Test: CSSOM MediaList Interfaces</title>
>-  <link rel="author" title="Chapman Shoop" href="mailto:chapman.shoop@gmail.com">
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-medialist-interface">
>-  <meta name="flags" content="dom">
>-  <meta name="assert" content="MediaList object has appendMedium method and it functions properly.">
>-  <script src="/resources/testharness.js" type="text/javascript"></script>
>-  <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>-
>-  <script id="metadata_cache">/*
>-  {
>-    "appendMedium_correctly_appends_medium_to_empty_MediaList": { "assert": "MediaList.appendMedium correctly adds medium to empty MediaList." },
>-    "appendMedium_correctly_appends_medium_to_nonempty_MediaList": { "assert": "MediaList.appendMedium correctly adds medium to a MediaList that already has a medium." }
>-  }
>-*/</script>
>-
>-</head>
>-
>-<body>
>-  <noscript>Test not run - javascript required.</noscript>
>-  <div id="log"></div>
>-
>-  <script type="text/javascript">
>-    function setup() {
>-      // Clean out any old style element
>-      var old_style_el = document.getElementById('test_style');
>-      if (old_style_el) {
>-        document.head.removeChild(old_style_el);
>-      }
>-
>-      // Create a fresh style element and return its media attribute
>-      var style_el = document.createElement('style');
>-      style_el.setAttribute('id', 'test_style');
>-      document.head.appendChild(style_el);
>-      return style_el.sheet.media;
>-    }
>-  </script>
>-
>-  <script type="text/javascript">
>-
>-    test(function() {
>-      media_list = setup();
>-
>-      media_list.appendMedium("all");
>-
>-      assert_equals(media_list.length, 1);
>-      assert_equals(media_list.item(0), "all");
>-      assert_equals(media_list.mediaText, "all");
>-    }, "appendMedium_correctly_appends_medium_to_empty_MediaList",
>-    { assert: "MediaList.appendMedium correctly adds medium to empty MediaList." });
>-
>-    test(function() {
>-      media_list = setup();
>-
>-      media_list.appendMedium("screen");
>-      media_list.appendMedium("all");
>-
>-      // The ordering of array items should be different from that of the mediaText element.
>-      // "all" should be appended after "screen" in the array, but "mediaText" should be
>-      // "all, screen" due to lexicographical sorting.
>-      assert_equals(media_list.length, 2);
>-      assert_equals(media_list.item(0), "screen");
>-      assert_equals(media_list.item(1), "all");
>-      assert_equals(media_list.mediaText, "all, screen");
>-    }, "appendMedium_correctly_appends_medium_to_nonempty_MediaList",
>-    { assert: "MediaList.appendMedium correctly adds medium to a MediaList that already has a medium." });
>-
>-  </script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/overflow-serialization-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/overflow-serialization-expected.txt
>deleted file mode 100644
>index ee2f8324165ba36d119f0596e75218befdbb6999..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/overflow-serialization-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-FAIL CSSOM - Overlow property has different serialization than other shorthands. assert_equals: Overflow-x/y longhands with same CSS-wide keyword should serialize correctly. expected "overflow: initial;" but got ""
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/overflow-serialization.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/overflow-serialization.html
>deleted file mode 100644
>index c350a1ac2119c1c1011be6f71270cf940414efea..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/overflow-serialization.html
>+++ /dev/null
>@@ -1,48 +0,0 @@
>-<!doctype html>
>-<html>
>-<head>
>-    <meta charset="utf-8">
>-    <title>CSSOM - Overlow property has different serialization than other shorthands.</title>
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-    <style>
>-        div { overflow: inherit; }
>-        div { overflow: hidden; }
>-        div { overflow-x: initial; overflow-y: initial; }
>-        div { overflow-x: scroll; overflow-y: scroll; }
>-        div { overflow-x: inherit; overflow-y: unset; }
>-    </style>
>-
>-    <script>
>-    test(function () {
>-        var styleSheet = document.styleSheets[0];
>-
>-        assert_equals(styleSheet.cssRules[0].style.cssText, "overflow: inherit;", "Single value overflow with CSS-wide keyword should serialize correctly.");
>-        assert_equals(styleSheet.cssRules[1].style.cssText, "overflow: hidden;", "Single value overflow with non-CSS-wide keyword should serialize correctly.");
>-        assert_equals(styleSheet.cssRules[2].style.cssText, "overflow: initial;", "Overflow-x/y longhands with same CSS-wide keyword should serialize correctly.");
>-        assert_equals(styleSheet.cssRules[3].style.cssText, "overflow: scroll;", "Overflow-x/y longhands with same non-CSS-wide keyword should serialize correctly.");
>-        assert_equals(styleSheet.cssRules[4].style.cssText, "overflow-x: inherit; overflow-y: unset;", "Overflow-x/y longhands with different keywords should serialize correctly.");
>-
>-        var div = document.createElement('div');
>-        div.style.overflow = "inherit";
>-        assert_equals(div.style.overflow, "inherit", "Single value overflow with CSS-wide keyword should serialize correctly.");
>-
>-        div.style.overflow = "hidden";
>-        assert_equals(div.style.overflow, "hidden", "Single value overflow with non-CSS-wide keyword should serialize correctly.");
>-
>-        div.style.overflow = "";
>-        div.style.overflowX = "initial";
>-        div.style.overflowY = "initial";
>-        assert_equals(div.style.overflow, "initial", "Overflow-x/y longhands with same CSS-wide keyword should serialize correctly.");
>-
>-        div.style.overflowX = "scroll";
>-        div.style.overflowY = "scroll";
>-        assert_equals(div.style.overflow, "scroll", "Overflow-x/y longhands with same non-CSS-wide keyword should serialize correctly.");
>-
>-        div.style.overflowX = "inherit";
>-        div.style.overflowY = "unset";
>-        assert_equals(div.style.overflow, "", "Overflow-x/y longhands with different keywords shouldn't serialize.");
>-    });
>-    </script>
>-</head>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorSerialize-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorSerialize-expected.txt
>deleted file mode 100644
>index 1021b15b82084153b756ef506f3c22cf16ef0c21..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorSerialize-expected.txt
>+++ /dev/null
>@@ -1,14 +0,0 @@
>-
>-FAIL :nth-child serialization produces canonical form assert_equals: expected ":nth-child(3n)" but got ":nth-child(3n - 0)"
>-PASS single universal selector shows '*' when serialized. 
>-PASS single type (simple) selector in the sequence of simple selectors that is not a universal selector 
>-PASS single class (simple) selector in the sequence of simple selectors that is not a universal selector 
>-PASS single id (simple) selector in the sequence of simple selectors that is not a universal selector 
>-PASS single pseudo (simple) selector which does not accept arguments in the sequence of simple selectors that is not a universal selector 
>-FAIL single pseudo (simple) selector "lang" which accepts arguments in the sequence of simple selectors that is not a universal selector assert_equals: expected ":lang(ja)" but got ":lang(\"ja\")"
>-FAIL single pseudo (simple) selector "nth-child" which accepts arguments in the sequence of simple selectors that is not a universal selector assert_equals: expected ":nth-child(2n)" but got ":nth-child(even)"
>-FAIL single pseudo (simple) selector "nth-last-child" which accepts arguments in the sequence of simple selectors that is not a universal selector assert_equals: expected ":nth-last-child(2n)" but got ":nth-last-child(even)"
>-FAIL single pseudo (simple) selector "nth-of-child" which accepts arguments in the sequence of simple selectors that is not a universal selector assert_equals: expected ":nth-of-type(2n)" but got ":nth-of-type(even)"
>-FAIL single pseudo (simple) selector ":nth-last-of-type" which accepts arguments in the sequence of simple selectors that is not a universal selector assert_equals: expected ":nth-last-of-type(2n)" but got ":nth-last-of-type(even)"
>-PASS single pseudo (simple) selector ":not" which accepts arguments in the sequence of simple selectors that is not a universal selector 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorSerialize.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorSerialize.html
>deleted file mode 100644
>index fc9445ca96a43254c5bb3d88b7bbcfa170236614..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorSerialize.html
>+++ /dev/null
>@@ -1,107 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-    <head>
>-        <title>CSSOM Test: test serialized selector which is only one simple selector in the sequence of simple selectors</title>
>-        <link rel="author" title="T.Nishitani" href="mailto:lequinharay@gmail.com">
>-        <link rel="reviewer" title="L. David Baron" href="https://dbaron.org/">
>-        <link rel="help" href="https://drafts.csswg.org/cssom-1/#serializing-selectors">
>-        <meta name="flags" content="dom">
>-        <meta charset="utf-8">
>-        <script src="/resources/testharness.js"></script>
>-        <script src="/resources/testharnessreport.js"></script>
>-        <style id="teststyles">
>-        </style>
>-    </head>
>-    <body>
>-        <div id="log"></div>
>-        <script>
>-            function assert_selector_serializes_to(source, expected_result) {
>-              var style_element = document.getElementById("teststyles");
>-              style_element.firstChild.data = source + "{ font-size: 1em; }";
>-              var sheet = style_element.sheet;
>-              assert_equals(sheet.cssRules[0].selectorText, expected_result);
>-            }
>-
>-            function run_tests_on_anplusb_selector(source) {
>-                assert_selector_serializes_to(source + '( even   )', source + '(2n)');
>-                assert_selector_serializes_to(source + '(   odd )', source + '(2n+1)');
>-                assert_selector_serializes_to(source + '( +10  )', source + '(10)');
>-                assert_selector_serializes_to(source + '(   -10 )', source + '(-10)');
>-                assert_selector_serializes_to(source + '( +4n  )', source + '(4n)');
>-                assert_selector_serializes_to(source + '( -3n   )', source + '(-3n)');
>-                assert_selector_serializes_to(source + '( 1n + 5  )', source + '(n+5)');
>-                assert_selector_serializes_to(source + '( -1n +     5 )', source + '(-n+5)');
>-                assert_selector_serializes_to(source + '( -1n     - 5 )', source + '(-n-5)');
>-            }
>-
>-            test(function() {
>-              assert_selector_serializes_to(":nth-child(  3n - 0)", ":nth-child(3n)");
>-              assert_selector_serializes_to(":nth-child(  1n - 0)", ":nth-child(n)");
>-            }, ":nth-child serialization produces canonical form");
>-
>-
>-            /* for universal selecter with default namespace */
>-            test(function(){
>-                /* this is single universal selector */
>-                assert_selector_serializes_to('*', '*');
>-                assert_selector_serializes_to(' * ', '*');
>-            }, 'single universal selector shows \'*\' when serialized.')
>-
>-            test(function(){
>-                assert_selector_serializes_to('div', 'div');
>-                assert_selector_serializes_to(' div ', 'div');
>-            }, 'single type (simple) selector in the sequence of simple selectors that is not a universal selector')
>-
>-            test(function(){
>-                assert_selector_serializes_to('.class', '.class');
>-                assert_selector_serializes_to(' .class    ', '.class');
>-            }, 'single class (simple) selector in the sequence of simple selectors that is not a universal selector')
>-
>-            test(function(){
>-                assert_selector_serializes_to('#id', '#id');
>-                assert_selector_serializes_to('     #id ', '#id');
>-            }, 'single id (simple) selector in the sequence of simple selectors that is not a universal selector')
>-
>-            test(function(){
>-                assert_selector_serializes_to(':hover', ':hover');
>-                assert_selector_serializes_to('    :hover    ', ':hover');
>-            }, 'single pseudo (simple) selector which does not accept arguments in the sequence of simple selectors that is not a universal selector')
>-
>-            test(function(){
>-                assert_selector_serializes_to(':lang(ja)', ':lang(ja)');
>-                assert_selector_serializes_to(':lang( ja )', ':lang(ja)');
>-            }, 'single pseudo (simple) selector "lang" which accepts arguments in the sequence of simple selectors that is not a universal selector')
>-
>-
>-
>-
>-            test(function(){
>-                run_tests_on_anplusb_selector(':nth-child');
>-            }, 'single pseudo (simple) selector "nth-child" which accepts arguments in the sequence of simple selectors that is not a universal selector')
>-
>-            test(function(){
>-                run_tests_on_anplusb_selector(':nth-last-child');
>-            }, 'single pseudo (simple) selector "nth-last-child" which accepts arguments in the sequence of simple selectors that is not a universal selector')
>-
>-            test(function(){
>-                run_tests_on_anplusb_selector(':nth-of-type');
>-            }, 'single pseudo (simple) selector "nth-of-child" which accepts arguments in the sequence of simple selectors that is not a universal selector')
>-
>-            test(function(){
>-                run_tests_on_anplusb_selector(':nth-last-of-type');
>-            }, 'single pseudo (simple) selector ":nth-last-of-type" which accepts arguments in the sequence of simple selectors that is not a universal selector')
>-
>-            test(function(){
>-                assert_selector_serializes_to(' :not( abc ) ', ':not(abc)');
>-                assert_selector_serializes_to(' :not(  .head ) ', ':not(.head)');
>-                assert_selector_serializes_to(' :not(  #head   ) ', ':not(#head)');
>-                assert_selector_serializes_to(' :not(  :hover   ) ', ':not(:hover)');
>-            }, 'single pseudo (simple) selector ":not" which accepts arguments in the sequence of simple selectors that is not a universal selector')
>-
>-
>-
>-
>-
>-        </script>
>-    </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorText-modification-restyle-001-expected.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorText-modification-restyle-001-expected.html
>deleted file mode 100644
>index 74e580747083b3e9ff8d48876c08b83ddaa8d5cb..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorText-modification-restyle-001-expected.html
>+++ /dev/null
>@@ -1,13 +0,0 @@
>-<!doctype html>
>-<meta charset="utf-8">
>-<title>(Ref #1) CSSOM - CSSStyleRule.selectorText Modification Restyle - Reference #1</title>
>-
>-<style>
>-div {
>-  color: green;
>-}
>-</style>
>-
>-<body>
>-<div>I should be green.</div>
>-</body>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorText-modification-restyle-001.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorText-modification-restyle-001.html
>deleted file mode 100644
>index 681d32f1865452d5896f29bfdf0d555b56e3ae57..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorText-modification-restyle-001.html
>+++ /dev/null
>@@ -1,21 +0,0 @@
>-<!doctype html>
>-<meta charset="utf-8">
>-<title>(Test #1) CSSOM - CSSStyleRule.selectorText Modification Restyle - Test #1</title>
>-<link rel="match" href="selectorText-modification-restyle-001-ref.html">
>-
>-<style>
>-@namespace bogus url(http://example.com/bogus);
>-
>-bogus|div {
>-  color: green;
>-}
>-</style>
>-
>-<body>
>-<div>I should be green.</div>
>-<script>
>-// Remove the "bogus" namespace--now it should apply to the div above.
>-// We also expect to see a restyle.
>-document.querySelector("style").sheet.cssRules[1].selectorText = "div";
>-</script>
>-</body>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialization-CSSDeclaration-with-important-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/serialization-CSSDeclaration-with-important-expected.txt
>deleted file mode 100644
>index 3a82c9e37815254223cce8799797db64734d76b1..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialization-CSSDeclaration-with-important-expected.txt
>+++ /dev/null
>@@ -1,6 +0,0 @@
>-
>-PASS Inline style declaration without whitespace between '!' and 'important'. 
>-PASS Inline style declaration with whitespace between '!' and 'important'. 
>-PASS Style set dynamically via cssText without whitespace between '!' and 'important'. 
>-PASS Style set dynamically via cssText with whitespace between '!' and 'important'. 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialization-CSSDeclaration-with-important.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/serialization-CSSDeclaration-with-important.html
>deleted file mode 100644
>index 0f165ae0cd29faa5a6aec78b75da623b2c73916b..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialization-CSSDeclaration-with-important.html
>+++ /dev/null
>@@ -1,31 +0,0 @@
>-<!doctype html>
>-<meta charset=utf-8>
>-<title>cssom - Serialization of CSS declaration with "important" flag</title>
>-<script src=/resources/testharness.js></script>
>-<script src=/resources/testharnessreport.js></script>
>-<div id="noWhitespace" style="display: inline !important;"></div>
>-<div id="whitespace" style="background-color: blue !important; color: red ! important;"></div>
>-<div id="dinamicallyStyle"></div>
>-<script>
>-    test(function () {
>-        var css_style = document.querySelector('#noWhitespace').style.cssText;
>-        assert_equals(css_style, "display: inline !important;");
>-    }, "Inline style declaration without whitespace between '!' and 'important'.");
>-
>-    test(function () {
>-        var css_style = document.querySelector('#whitespace').style.cssText;
>-        assert_equals(css_style, "background-color: blue !important; color: red !important;");
>-    }, "Inline style declaration with whitespace between '!' and 'important'.");
>-
>-    test(function () {
>-        document.querySelector('#dinamicallyStyle').style.cssText = "color: black !important;";
>-        var css_style = document.querySelector('#dinamicallyStyle').style.cssText;
>-        assert_equals(css_style, "color: black !important;");
>-    }, "Style set dynamically via cssText without whitespace between '!' and 'important'.");
>-
>-    test(function () {
>-        document.querySelector('#dinamicallyStyle').style.cssText = "color: black ! important;";
>-        var css_style = document.querySelector('#dinamicallyStyle').style.cssText;
>-        assert_equals(css_style, "color: black !important;");
>-    }, "Style set dynamically via cssText with whitespace between '!' and 'important'.");
>-</script>
>\ No newline at end of file
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-namespaced-type-selectors-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-namespaced-type-selectors-expected.txt
>deleted file mode 100644
>index 30840a89404cdf762cc1501f0b083e951fb136eb..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-namespaced-type-selectors-expected.txt
>+++ /dev/null
>@@ -1,62 +0,0 @@
>-
>-PASS Simple type selector 
>-PASS Type selector without a namespace 
>-PASS Type selector with any namespace 
>-PASS Universal selector 
>-PASS Universal selector without a namespace 
>-PASS Universal selector in any namespace 
>-PASS Type selector with namespace 
>-PASS Universal selector with namespace 
>-PASS Simple type selector followed by class 
>-PASS Simple type selector followed by id 
>-PASS Simple type selector followed by pseudo class 
>-PASS Simple type selector followed by pseudo element 
>-PASS Simple type selector followed by atttribute selector 
>-PASS Type selector without a namespace followed by class 
>-PASS Type selector without a namespace followed by id 
>-PASS Type selector without a namespace followed by pseudo class 
>-PASS Type selector without a namespace followed by pseudo element 
>-PASS Type selector without a namespace followed by attribute selector 
>-PASS Type selector with any namespace followed by class 
>-PASS Type selector with any namespace followed by id 
>-PASS Type selector with any namespace followed by pseudo class 
>-PASS Type selector with any namespace followed by pseudo element 
>-PASS Type selector with any namespace followed by attribute selector 
>-PASS Universal selector followed by class 
>-PASS Universal selector followed by id 
>-PASS Universal selector followed by pseudo class 
>-PASS Universal selector followed by pseudo element 
>-PASS Universal selector followed by attribute selector 
>-PASS Universal selector without a namespace followed by class 
>-PASS Universal selector without a namespace followed by id 
>-PASS Universal selector without a namespace followed by pseudo class 
>-PASS Universal selector without a namespace followed by pseudo element 
>-PASS Universal selector without a namespace followed by attribute selector 
>-PASS Universal selector in any namespace followed by class 
>-PASS Universal selector in any namespace followed by id 
>-PASS Universal selector in any namespace followed by pseudo class 
>-PASS Universal selector in any namespace followed by pseudo element 
>-PASS Universal selector in any namespace followed by attribute selector 
>-PASS Type selector with namespace followed by class 
>-PASS Type selector with namespace followed by id 
>-PASS Type selector with namespace followed by pseudo class 
>-PASS Type selector with namespace followed by pseudo element 
>-PASS Type selector with namespace followed by attribute selector 
>-PASS Universal selector with namespace followed by class 
>-PASS Universal selector with namespace followed by id 
>-PASS Universal selector with namespace followed by pseudo class 
>-PASS Universal selector with namespace followed by pseudo element 
>-PASS Universal selector with namespace followed by attribute selector 
>-PASS Type selector with namespace equal to default namespace 
>-PASS Universal selector with namespace equal to default namespace 
>-PASS Type selector with namespace equal to default namespace followed by class 
>-PASS Type selector with namespace equal to default namespace followed by id 
>-PASS Type selector with namespace equal to default namespace followed by pseudo class 
>-PASS Type selector with namespace equal to default namespace followed by pseudo element 
>-PASS Type selector with namespace equal to default namespace followed by attribute selector 
>-PASS Universal selector with namespace equal to default namespace followed by class 
>-PASS Universal selector with namespace equal to default namespace followed by id 
>-PASS Universal selector with namespace equal to default namespace followed by pseudo class 
>-PASS Universal selector with namespace equal to default namespace followed by pseudo element 
>-PASS Universal selector with namespace equal to default namespace followed by attribute selector 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-namespaced-type-selectors.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-namespaced-type-selectors.html
>deleted file mode 100644
>index 600008c7a9eb7351b15ede25b870525882b32a0c..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-namespaced-type-selectors.html
>+++ /dev/null
>@@ -1,257 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-    <head>
>-        <title>CSSOM Test: test serialization of type selectors and namespace prefixes</title>
>-        <link rel="author" title="Rune Lillesveen" href="mailto:rune@opera.com">
>-        <link rel="help" href="https://drafts.csswg.org/cssom-1/#serializing-selectors">
>-        <meta name="flags" content="dom">
>-        <meta charset="utf-8">
>-        <script src="/resources/testharness.js"></script>
>-        <script src="/resources/testharnessreport.js"></script>
>-        <style id="teststyles">
>-        </style>
>-    </head>
>-    <body>
>-        <div id="log"></div>
>-        <script>
>-            var ns_rule = "@namespace ns url(ns);";
>-            var default_ns_rules = "@namespace url(default_ns); @namespace nsdefault url(default_ns);" + ns_rule;
>-
>-            function assert_selector_serializes_to(source, expected_result) {
>-                var style_element = document.getElementById("teststyles");
>-                style_element.firstChild.data = source + "{ font-size: 1em; }";
>-                var sheet = style_element.sheet;
>-                assert_equals(sheet.cssRules[sheet.cssRules.length - 1].selectorText, expected_result);
>-            }
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "e", "e");
>-                assert_selector_serializes_to(default_ns_rules + "e", "e");
>-            }, "Simple type selector");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "|e", "|e");
>-                assert_selector_serializes_to(default_ns_rules + "|e", "|e");
>-            }, "Type selector without a namespace");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*|e", "e");
>-                assert_selector_serializes_to(default_ns_rules + "*|e", "*|e");
>-            }, "Type selector with any namespace");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*", "*");
>-                assert_selector_serializes_to(default_ns_rules + "*", "*");
>-            }, "Universal selector");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "|*", "|*");
>-                assert_selector_serializes_to(default_ns_rules + "|*", "|*");
>-            }, "Universal selector without a namespace");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*|*", "*");
>-                assert_selector_serializes_to(default_ns_rules + "*|*", "*|*");
>-            }, "Universal selector in any namespace");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "ns|e", "ns|e");
>-                assert_selector_serializes_to(default_ns_rules + "ns|e", "ns|e");
>-            }, "Type selector with namespace");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "ns|*", "ns|*");
>-                assert_selector_serializes_to(default_ns_rules + "ns|*", "ns|*");
>-            }, "Universal selector with namespace");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "e.c", "e.c");
>-                assert_selector_serializes_to(default_ns_rules + "e.c", "e.c");
>-            }, "Simple type selector followed by class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "e#i", "e#i");
>-                assert_selector_serializes_to(default_ns_rules + "e#i", "e#i");
>-            }, "Simple type selector followed by id");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "e:hover", "e:hover");
>-                assert_selector_serializes_to(default_ns_rules + "e:hover", "e:hover");
>-            }, "Simple type selector followed by pseudo class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "e::before", "e::before");
>-                assert_selector_serializes_to(default_ns_rules + "e::before", "e::before");
>-            }, "Simple type selector followed by pseudo element");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "e[attr]", "e[attr]");
>-                assert_selector_serializes_to(default_ns_rules + "e[attr]", "e[attr]");
>-            }, "Simple type selector followed by atttribute selector");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "|e.c", "|e.c");
>-                assert_selector_serializes_to(default_ns_rules + "|e.c", "|e.c");
>-            }, "Type selector without a namespace followed by class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "|e#i", "|e#i");
>-                assert_selector_serializes_to(default_ns_rules + "|e#i", "|e#i");
>-            }, "Type selector without a namespace followed by id");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "|e:hover", "|e:hover");
>-                assert_selector_serializes_to(default_ns_rules + "|e:hover", "|e:hover");
>-            }, "Type selector without a namespace followed by pseudo class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "|e::before", "|e::before");
>-                assert_selector_serializes_to(default_ns_rules + "|e::before", "|e::before");
>-            }, "Type selector without a namespace followed by pseudo element");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "|e[attr]", "|e[attr]");
>-                assert_selector_serializes_to(default_ns_rules + "|e[attr]", "|e[attr]");
>-            }, "Type selector without a namespace followed by attribute selector");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*|e.c", "e.c");
>-                assert_selector_serializes_to(default_ns_rules + "*|e.c", "*|e.c");
>-            }, "Type selector with any namespace followed by class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*|e#id", "e#id");
>-                assert_selector_serializes_to(default_ns_rules + "*|e#id", "*|e#id");
>-            }, "Type selector with any namespace followed by id");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*|e:hover", "e:hover");
>-                assert_selector_serializes_to(default_ns_rules + "*|e:hover", "*|e:hover");
>-            }, "Type selector with any namespace followed by pseudo class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*|e::before", "e::before");
>-                assert_selector_serializes_to(default_ns_rules + "*|e::before", "*|e::before");
>-            }, "Type selector with any namespace followed by pseudo element");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*|e[attr]", "e[attr]");
>-                assert_selector_serializes_to(default_ns_rules + "*|e[attr]", "*|e[attr]");
>-            }, "Type selector with any namespace followed by attribute selector");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*.c", ".c");
>-                assert_selector_serializes_to(default_ns_rules + "*.c", ".c");
>-            }, "Universal selector followed by class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*#i", "#i");
>-                assert_selector_serializes_to(default_ns_rules + "*#i", "#i");
>-            }, "Universal selector followed by id");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*:hover", ":hover");
>-                assert_selector_serializes_to(default_ns_rules + "*:hover", ":hover");
>-            }, "Universal selector followed by pseudo class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*::before", "::before");
>-                assert_selector_serializes_to(default_ns_rules + "*::before", "::before");
>-            }, "Universal selector followed by pseudo element");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*[attr]", "[attr]");
>-                assert_selector_serializes_to(default_ns_rules + "*[attr]", "[attr]");
>-            }, "Universal selector followed by attribute selector");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "|*.c", "|*.c");
>-                assert_selector_serializes_to(default_ns_rules + "|*.c", "|*.c");
>-            }, "Universal selector without a namespace followed by class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "|*#i", "|*#i");
>-                assert_selector_serializes_to(default_ns_rules + "|*#i", "|*#i");
>-            }, "Universal selector without a namespace followed by id");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "|*:hover", "|*:hover");
>-                assert_selector_serializes_to(default_ns_rules + "|*:hover", "|*:hover");
>-            }, "Universal selector without a namespace followed by pseudo class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "|*::before", "|*::before");
>-                assert_selector_serializes_to(default_ns_rules + "|*::before", "|*::before");
>-            }, "Universal selector without a namespace followed by pseudo element");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "|*[attr]", "|*[attr]");
>-                assert_selector_serializes_to(default_ns_rules + "|*[attr]", "|*[attr]");
>-            }, "Universal selector without a namespace followed by attribute selector");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*|*.c", ".c");
>-                assert_selector_serializes_to(default_ns_rules + "*|*.c", "*|*.c");
>-            }, "Universal selector in any namespace followed by class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*|*#id", "#id");
>-                assert_selector_serializes_to(default_ns_rules + "*|*#id", "*|*#id");
>-            }, "Universal selector in any namespace followed by id");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*|*:hover", ":hover");
>-                assert_selector_serializes_to(default_ns_rules + "*|*:hover", "*|*:hover");
>-            }, "Universal selector in any namespace followed by pseudo class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*|*::before", "::before");
>-                assert_selector_serializes_to(default_ns_rules + "*|*::before", "*|*::before");
>-            }, "Universal selector in any namespace followed by pseudo element");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "*|*[attr]", "[attr]");
>-                assert_selector_serializes_to(default_ns_rules + "*|*[attr]", "*|*[attr]");
>-            }, "Universal selector in any namespace followed by attribute selector");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "ns|e.c", "ns|e.c");
>-                assert_selector_serializes_to(default_ns_rules + "ns|e.c", "ns|e.c");
>-            }, "Type selector with namespace followed by class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "ns|e#i", "ns|e#i");
>-                assert_selector_serializes_to(default_ns_rules + "ns|e#i", "ns|e#i");
>-            }, "Type selector with namespace followed by id");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "ns|e:hover", "ns|e:hover");
>-                assert_selector_serializes_to(default_ns_rules + "ns|e:hover", "ns|e:hover");
>-            }, "Type selector with namespace followed by pseudo class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "ns|e::before", "ns|e::before");
>-                assert_selector_serializes_to(default_ns_rules + "ns|e::before", "ns|e::before");
>-            }, "Type selector with namespace followed by pseudo element");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "ns|e[attr]", "ns|e[attr]");
>-                assert_selector_serializes_to(default_ns_rules + "ns|e[attr]", "ns|e[attr]");
>-            }, "Type selector with namespace followed by attribute selector");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "ns|*.c", "ns|*.c");
>-                assert_selector_serializes_to(default_ns_rules + "ns|*.c", "ns|*.c");
>-            }, "Universal selector with namespace followed by class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "ns|*#i", "ns|*#i");
>-                assert_selector_serializes_to(default_ns_rules + "ns|*#i", "ns|*#i");
>-            }, "Universal selector with namespace followed by id");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "ns|*:hover", "ns|*:hover");
>-                assert_selector_serializes_to(default_ns_rules + "ns|*:hover", "ns|*:hover");
>-            }, "Universal selector with namespace followed by pseudo class");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "ns|*::before", "ns|*::before");
>-                assert_selector_serializes_to(default_ns_rules + "ns|*::before", "ns|*::before");
>-            }, "Universal selector with namespace followed by pseudo element");
>-            test(function() {
>-                assert_selector_serializes_to(ns_rule + "ns|*[attr]", "ns|*[attr]");
>-                assert_selector_serializes_to(default_ns_rules + "ns|*[attr]", "ns|*[attr]");
>-            }, "Universal selector with namespace followed by attribute selector");
>-            test(function() {
>-                assert_selector_serializes_to(default_ns_rules + "nsdefault|e", "e");
>-            }, "Type selector with namespace equal to default namespace");
>-            test(function() {
>-                assert_selector_serializes_to(default_ns_rules + "nsdefault|*", "*");
>-            }, "Universal selector with namespace equal to default namespace");
>-            test(function() {
>-                assert_selector_serializes_to(default_ns_rules + "nsdefault|e.c", "e.c");
>-            }, "Type selector with namespace equal to default namespace followed by class");
>-            test(function() {
>-                assert_selector_serializes_to(default_ns_rules + "nsdefault|e#i", "e#i");
>-            }, "Type selector with namespace equal to default namespace followed by id");
>-            test(function() {
>-                assert_selector_serializes_to(default_ns_rules + "nsdefault|e:hover", "e:hover");
>-            }, "Type selector with namespace equal to default namespace followed by pseudo class");
>-            test(function() {
>-                assert_selector_serializes_to(default_ns_rules + "nsdefault|e::before", "e::before");
>-            }, "Type selector with namespace equal to default namespace followed by pseudo element");
>-            test(function() {
>-                assert_selector_serializes_to(default_ns_rules + "nsdefault|e[attr]", "e[attr]");
>-            }, "Type selector with namespace equal to default namespace followed by attribute selector");
>-            test(function() {
>-                assert_selector_serializes_to(default_ns_rules + "nsdefault|*.c", ".c");
>-            }, "Universal selector with namespace equal to default namespace followed by class");
>-            test(function() {
>-                assert_selector_serializes_to(default_ns_rules + "nsdefault|*#i", "#i");
>-            }, "Universal selector with namespace equal to default namespace followed by id");
>-            test(function() {
>-                assert_selector_serializes_to(default_ns_rules + "nsdefault|*:hover", ":hover");
>-            }, "Universal selector with namespace equal to default namespace followed by pseudo class");
>-            test(function() {
>-                assert_selector_serializes_to(default_ns_rules + "nsdefault|*::before", "::before");
>-            }, "Universal selector with namespace equal to default namespace followed by pseudo element");
>-            test(function() {
>-                assert_selector_serializes_to(default_ns_rules + "nsdefault|*[attr]", "[attr]");
>-            }, "Universal selector with namespace equal to default namespace followed by attribute selector");
>-        </script>
>-    </body>
>-</html>
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-values-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-values-expected.txt
>deleted file mode 100644
>index c4cf77abf695cac7ea90ca47bdd4feea782b1ac5..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-values-expected.txt
>+++ /dev/null
>@@ -1,679 +0,0 @@
>-
>-PASS background-attachment: scroll 
>-PASS background-attachment: fixed 
>-PASS background-attachment: inherit 
>-PASS background-color: black 
>-PASS background-color: red 
>-PASS background-color: rgb(50, 75, 100) 
>-FAIL background-color: rgba(5, 7, 10, 0.5) assert_equals: background-color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>-PASS background-color: transparent 
>-PASS background-color: inherit 
>-PASS background-image: url("http://localhost/") 
>-PASS background-image: url(http://localhost/) 
>-PASS background-image: none 
>-PASS background-image: inherit 
>-PASS background-position: 5% 5% 
>-PASS background-position: 5% .5% 
>-PASS background-position: 5% -5% 
>-PASS background-position: 5% -.5% 
>-PASS background-position: 5% 0px 
>-PASS background-position: 5% 1px 
>-PASS background-position: 5% .1em 
>-PASS background-position: 5% -0px 
>-PASS background-position: 5% -1px 
>-PASS background-position: 5% -.1em 
>-PASS background-position: 5% top 
>-PASS background-position: 5% center 
>-PASS background-position: 5% bottom 
>-PASS background-position: .5% 5% 
>-PASS background-position: .5% .5% 
>-PASS background-position: .5% -5% 
>-PASS background-position: .5% -.5% 
>-PASS background-position: .5% 0px 
>-PASS background-position: .5% 1px 
>-PASS background-position: .5% .1em 
>-PASS background-position: .5% -0px 
>-PASS background-position: .5% -1px 
>-PASS background-position: .5% -.1em 
>-PASS background-position: .5% top 
>-PASS background-position: .5% center 
>-PASS background-position: .5% bottom 
>-PASS background-position: -5% 5% 
>-PASS background-position: -5% .5% 
>-PASS background-position: -5% -5% 
>-PASS background-position: -5% -.5% 
>-PASS background-position: -5% 0px 
>-PASS background-position: -5% 1px 
>-PASS background-position: -5% .1em 
>-PASS background-position: -5% -0px 
>-PASS background-position: -5% -1px 
>-PASS background-position: -5% -.1em 
>-PASS background-position: -5% top 
>-PASS background-position: -5% center 
>-PASS background-position: -5% bottom 
>-PASS background-position: -.5% 5% 
>-PASS background-position: -.5% .5% 
>-PASS background-position: -.5% -5% 
>-PASS background-position: -.5% -.5% 
>-PASS background-position: -.5% 0px 
>-PASS background-position: -.5% 1px 
>-PASS background-position: -.5% .1em 
>-PASS background-position: -.5% -0px 
>-PASS background-position: -.5% -1px 
>-PASS background-position: -.5% -.1em 
>-PASS background-position: -.5% top 
>-PASS background-position: -.5% center 
>-PASS background-position: -.5% bottom 
>-PASS background-position: 0px 5% 
>-PASS background-position: 0px .5% 
>-PASS background-position: 0px -5% 
>-PASS background-position: 0px -.5% 
>-PASS background-position: 0px 0px 
>-PASS background-position: 0px 1px 
>-PASS background-position: 0px .1em 
>-PASS background-position: 0px -0px 
>-PASS background-position: 0px -1px 
>-PASS background-position: 0px -.1em 
>-PASS background-position: 0px top 
>-PASS background-position: 0px center 
>-PASS background-position: 0px bottom 
>-PASS background-position: 1px 5% 
>-PASS background-position: 1px .5% 
>-PASS background-position: 1px -5% 
>-PASS background-position: 1px -.5% 
>-PASS background-position: 1px 0px 
>-PASS background-position: 1px 1px 
>-PASS background-position: 1px .1em 
>-PASS background-position: 1px -0px 
>-PASS background-position: 1px -1px 
>-PASS background-position: 1px -.1em 
>-PASS background-position: 1px top 
>-PASS background-position: 1px center 
>-PASS background-position: 1px bottom 
>-PASS background-position: .1em 5% 
>-PASS background-position: .1em .5% 
>-PASS background-position: .1em -5% 
>-PASS background-position: .1em -.5% 
>-PASS background-position: .1em 0px 
>-PASS background-position: .1em 1px 
>-PASS background-position: .1em .1em 
>-PASS background-position: .1em -0px 
>-PASS background-position: .1em -1px 
>-PASS background-position: .1em -.1em 
>-PASS background-position: .1em top 
>-PASS background-position: .1em center 
>-PASS background-position: .1em bottom 
>-PASS background-position: -0px 5% 
>-PASS background-position: -0px .5% 
>-PASS background-position: -0px -5% 
>-PASS background-position: -0px -.5% 
>-PASS background-position: -0px 0px 
>-PASS background-position: -0px 1px 
>-PASS background-position: -0px .1em 
>-PASS background-position: -0px -0px 
>-PASS background-position: -0px -1px 
>-PASS background-position: -0px -.1em 
>-PASS background-position: -0px top 
>-PASS background-position: -0px center 
>-PASS background-position: -0px bottom 
>-PASS background-position: -1px 5% 
>-PASS background-position: -1px .5% 
>-PASS background-position: -1px -5% 
>-PASS background-position: -1px -.5% 
>-PASS background-position: -1px 0px 
>-PASS background-position: -1px 1px 
>-PASS background-position: -1px .1em 
>-PASS background-position: -1px -0px 
>-PASS background-position: -1px -1px 
>-PASS background-position: -1px -.1em 
>-PASS background-position: -1px top 
>-PASS background-position: -1px center 
>-PASS background-position: -1px bottom 
>-PASS background-position: -.1em 5% 
>-PASS background-position: -.1em .5% 
>-PASS background-position: -.1em -5% 
>-PASS background-position: -.1em -.5% 
>-PASS background-position: -.1em 0px 
>-PASS background-position: -.1em 1px 
>-PASS background-position: -.1em .1em 
>-PASS background-position: -.1em -0px 
>-PASS background-position: -.1em -1px 
>-PASS background-position: -.1em -.1em 
>-PASS background-position: -.1em top 
>-PASS background-position: -.1em center 
>-PASS background-position: -.1em bottom 
>-PASS background-position: left 5% 
>-PASS background-position: left .5% 
>-PASS background-position: left -5% 
>-PASS background-position: left -.5% 
>-PASS background-position: left 0px 
>-PASS background-position: left 1px 
>-PASS background-position: left .1em 
>-PASS background-position: left -0px 
>-PASS background-position: left -1px 
>-PASS background-position: left -.1em 
>-PASS background-position: left top 
>-PASS background-position: left center 
>-PASS background-position: left bottom 
>-PASS background-position: center 5% 
>-PASS background-position: center .5% 
>-PASS background-position: center -5% 
>-PASS background-position: center -.5% 
>-PASS background-position: center 0px 
>-PASS background-position: center 1px 
>-PASS background-position: center .1em 
>-PASS background-position: center -0px 
>-PASS background-position: center -1px 
>-PASS background-position: center -.1em 
>-PASS background-position: center top 
>-PASS background-position: center center 
>-PASS background-position: center bottom 
>-PASS background-position: right 5% 
>-PASS background-position: right .5% 
>-PASS background-position: right -5% 
>-PASS background-position: right -.5% 
>-PASS background-position: right 0px 
>-PASS background-position: right 1px 
>-PASS background-position: right .1em 
>-PASS background-position: right -0px 
>-PASS background-position: right -1px 
>-PASS background-position: right -.1em 
>-PASS background-position: right top 
>-PASS background-position: right center 
>-PASS background-position: right bottom 
>-PASS background-position: inherit 
>-PASS background-repeat: repeat 
>-PASS background-repeat: repeat-x 
>-PASS background-repeat: repeat-y 
>-PASS background-repeat: no-repeat 
>-PASS background-repeat: inherit 
>-PASS border-collapse: collapse 
>-PASS border-collapse: separate 
>-PASS border-collapse: inherit 
>-PASS border-spacing: 0px 
>-PASS border-spacing: 1px 
>-PASS border-spacing: .1em 
>-PASS border-spacing: inherit 
>-PASS border-top-color: black 
>-PASS border-top-color: red 
>-PASS border-top-color: rgb(50, 75, 100) 
>-FAIL border-top-color: rgba(5, 7, 10, 0.5) assert_equals: border-top-color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>-PASS border-top-color: transparent 
>-PASS border-top-color: inherit 
>-PASS border-right-color: black 
>-PASS border-right-color: red 
>-PASS border-right-color: rgb(50, 75, 100) 
>-FAIL border-right-color: rgba(5, 7, 10, 0.5) assert_equals: border-right-color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>-PASS border-right-color: transparent 
>-PASS border-right-color: inherit 
>-PASS border-bottom-color: black 
>-PASS border-bottom-color: red 
>-PASS border-bottom-color: rgb(50, 75, 100) 
>-FAIL border-bottom-color: rgba(5, 7, 10, 0.5) assert_equals: border-bottom-color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>-PASS border-bottom-color: transparent 
>-PASS border-bottom-color: inherit 
>-PASS border-left-color: black 
>-PASS border-left-color: red 
>-PASS border-left-color: rgb(50, 75, 100) 
>-FAIL border-left-color: rgba(5, 7, 10, 0.5) assert_equals: border-left-color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>-PASS border-left-color: transparent 
>-PASS border-left-color: inherit 
>-PASS border-top-style: none 
>-PASS border-top-style: hidden 
>-PASS border-top-style: dotted 
>-PASS border-top-style: dashed 
>-PASS border-top-style: solid 
>-PASS border-top-style: double 
>-PASS border-top-style: groove 
>-PASS border-top-style: ridge 
>-PASS border-top-style: inset 
>-PASS border-top-style: outset 
>-PASS border-top-style: inherit 
>-PASS border-right-style: none 
>-PASS border-right-style: hidden 
>-PASS border-right-style: dotted 
>-PASS border-right-style: dashed 
>-PASS border-right-style: solid 
>-PASS border-right-style: double 
>-PASS border-right-style: groove 
>-PASS border-right-style: ridge 
>-PASS border-right-style: inset 
>-PASS border-right-style: outset 
>-PASS border-right-style: inherit 
>-PASS border-bottom-style: none 
>-PASS border-bottom-style: hidden 
>-PASS border-bottom-style: dotted 
>-PASS border-bottom-style: dashed 
>-PASS border-bottom-style: solid 
>-PASS border-bottom-style: double 
>-PASS border-bottom-style: groove 
>-PASS border-bottom-style: ridge 
>-PASS border-bottom-style: inset 
>-PASS border-bottom-style: outset 
>-PASS border-bottom-style: inherit 
>-PASS border-left-style: none 
>-PASS border-left-style: hidden 
>-PASS border-left-style: dotted 
>-PASS border-left-style: dashed 
>-PASS border-left-style: solid 
>-PASS border-left-style: double 
>-PASS border-left-style: groove 
>-PASS border-left-style: ridge 
>-PASS border-left-style: inset 
>-PASS border-left-style: outset 
>-PASS border-left-style: inherit 
>-PASS border-top-width: thin 
>-PASS border-top-width: medium 
>-PASS border-top-width: thick 
>-PASS border-top-width: 0px 
>-PASS border-top-width: 1px 
>-PASS border-top-width: .1em 
>-PASS border-top-width: inherit 
>-PASS border-right-width: thin 
>-PASS border-right-width: medium 
>-PASS border-right-width: thick 
>-PASS border-right-width: 0px 
>-PASS border-right-width: 1px 
>-PASS border-right-width: .1em 
>-PASS border-right-width: inherit 
>-PASS border-bottom-width: thin 
>-PASS border-bottom-width: medium 
>-PASS border-bottom-width: thick 
>-PASS border-bottom-width: 0px 
>-PASS border-bottom-width: 1px 
>-PASS border-bottom-width: .1em 
>-PASS border-bottom-width: inherit 
>-PASS border-left-width: thin 
>-PASS border-left-width: medium 
>-PASS border-left-width: thick 
>-PASS border-left-width: 0px 
>-PASS border-left-width: 1px 
>-PASS border-left-width: .1em 
>-PASS border-left-width: inherit 
>-PASS bottom: 0px 
>-PASS bottom: 1px 
>-PASS bottom: .1em 
>-PASS bottom: 5% 
>-PASS bottom: .5% 
>-PASS bottom: auto 
>-PASS bottom: inherit 
>-PASS caption-side: top 
>-PASS caption-side: bottom 
>-PASS caption-side: inherit 
>-PASS clear: none 
>-PASS clear: left 
>-PASS clear: right 
>-PASS clear: both 
>-PASS clear: inherit 
>-PASS clip: rect(1em, auto, 0.5px, 2000em) 
>-PASS clip: auto 
>-PASS clip: inherit 
>-PASS color: black 
>-PASS color: red 
>-PASS color: rgb(50, 75, 100) 
>-FAIL color: rgba(5, 7, 10, 0.5) assert_equals: color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>-PASS color: inherit 
>-PASS content: normal 
>-PASS content: none 
>-FAIL content: "string" assert_equals: content raw inline style declaration expected "\"string\"" but got "string"
>-FAIL content: 'string' assert_equals: content raw inline style declaration expected "\"string\"" but got "string"
>-PASS content: url("http://localhost/") 
>-PASS content: url(http://localhost/) 
>-PASS content: counter(par-num) 
>-PASS content: counter(par-num, upper-roman) 
>-PASS content: attr(foo-bar) 
>-PASS content: attr(foo_bar) 
>-PASS content: inherit 
>-PASS cursor: auto 
>-PASS cursor: crosshair 
>-PASS cursor: default 
>-PASS cursor: pointer 
>-PASS cursor: move 
>-PASS cursor: e-resize 
>-PASS cursor: ne-resize 
>-PASS cursor: nw-resize 
>-PASS cursor: n-resize 
>-PASS cursor: se-resize 
>-PASS cursor: sw-resize 
>-PASS cursor: s-resize 
>-PASS cursor: w-resize 
>-PASS cursor: text 
>-PASS cursor: wait 
>-PASS cursor: help 
>-PASS cursor: progress 
>-PASS cursor: inherit 
>-PASS direction: ltr 
>-PASS direction: rtl 
>-PASS direction: inherit 
>-PASS display: inline 
>-PASS display: block 
>-PASS display: list-item 
>-PASS display: inline-block 
>-PASS display: table 
>-PASS display: inline-table 
>-PASS display: table-row-group 
>-PASS display: table-header-group 
>-PASS display: table-footer-group 
>-PASS display: table-row 
>-PASS display: table-column-group 
>-PASS display: table-column 
>-PASS display: table-cell 
>-PASS display: table-caption 
>-PASS display: none 
>-PASS display: inherit 
>-PASS empty-cells: show 
>-PASS empty-cells: hide 
>-PASS empty-cells: inherit 
>-PASS float: left 
>-PASS float: right 
>-PASS float: none 
>-PASS float: inherit 
>-PASS font-family: Arial 
>-PASS font-family: 'Lucida Grande' 
>-PASS font-family: serif 
>-PASS font-family: sans-serif 
>-PASS font-family: inherit 
>-PASS font-size: xx-small 
>-PASS font-size: x-small 
>-PASS font-size: small 
>-PASS font-size: medium 
>-PASS font-size: large 
>-PASS font-size: x-large 
>-PASS font-size: xx-large 
>-PASS font-size: larger 
>-PASS font-size: smaller 
>-PASS font-size: 0px 
>-PASS font-size: 1px 
>-PASS font-size: .1em 
>-PASS font-size: 5% 
>-PASS font-size: .5% 
>-PASS font-size: inherit 
>-PASS font-style: normal 
>-PASS font-style: italic 
>-PASS font-style: oblique 
>-PASS font-style: inherit 
>-FAIL font-variant: normal assert_equals: font-variant raw inline style declaration expected "normal" but got ""
>-FAIL font-variant: small-caps assert_equals: font-variant raw inline style declaration expected "small-caps" but got ""
>-FAIL font-variant: inherit assert_equals: font-variant raw inline style declaration expected "inherit" but got ""
>-PASS font-weight: normal 
>-PASS font-weight: bold 
>-PASS font-weight: bolder 
>-PASS font-weight: lighter 
>-PASS font-weight: 100 
>-PASS font-weight: 200 
>-PASS font-weight: 300 
>-PASS font-weight: 400 
>-PASS font-weight: 500 
>-PASS font-weight: 600 
>-PASS font-weight: 700 
>-PASS font-weight: 800 
>-PASS font-weight: 900 
>-PASS font-weight: inherit 
>-PASS height: 0px 
>-PASS height: 1px 
>-PASS height: .1em 
>-PASS height: 5% 
>-PASS height: .5% 
>-PASS height: auto 
>-PASS height: inherit 
>-PASS left: 0px 
>-PASS left: 1px 
>-PASS left: .1em 
>-PASS left: 5% 
>-PASS left: .5% 
>-PASS left: auto 
>-PASS left: inherit 
>-PASS letter-spacing: normal 
>-PASS letter-spacing: 0px 
>-PASS letter-spacing: 1px 
>-PASS letter-spacing: .1em 
>-PASS letter-spacing: inherit 
>-PASS line-height: normal 
>-PASS line-height: 0 
>-PASS line-height: -0 
>-PASS line-height: 1000 
>-PASS line-height: 0.9 
>-PASS line-height: 0px 
>-PASS line-height: 1px 
>-PASS line-height: .1em 
>-PASS line-height: 5% 
>-PASS line-height: .5% 
>-PASS line-height: inherit 
>-PASS list-style-image: url("http://localhost/") 
>-PASS list-style-image: url(http://localhost/) 
>-PASS list-style-image: none 
>-PASS list-style-image: inherit 
>-PASS list-style-position: inside 
>-PASS list-style-position: outside 
>-PASS list-style-position: inherit 
>-PASS list-style-type: disc 
>-PASS list-style-type: circle 
>-PASS list-style-type: square 
>-PASS list-style-type: decimal 
>-PASS list-style-type: decimal-leading-zero 
>-PASS list-style-type: lower-roman 
>-PASS list-style-type: upper-roman 
>-PASS list-style-type: lower-greek 
>-PASS list-style-type: lower-latin 
>-PASS list-style-type: upper-latin 
>-PASS list-style-type: armenian 
>-PASS list-style-type: georgian 
>-PASS list-style-type: lower-alpha 
>-PASS list-style-type: upper-alpha 
>-PASS list-style-type: none 
>-PASS list-style-type: inherit 
>-PASS margin-right: 0px 
>-PASS margin-right: 1px 
>-PASS margin-right: .1em 
>-PASS margin-right: 5% 
>-PASS margin-right: .5% 
>-PASS margin-right: auto 
>-PASS margin-right: inherit 
>-PASS margin-left: 0px 
>-PASS margin-left: 1px 
>-PASS margin-left: .1em 
>-PASS margin-left: 5% 
>-PASS margin-left: .5% 
>-PASS margin-left: auto 
>-PASS margin-left: inherit 
>-PASS margin-top: 0px 
>-PASS margin-top: 1px 
>-PASS margin-top: .1em 
>-PASS margin-top: 5% 
>-PASS margin-top: .5% 
>-PASS margin-top: auto 
>-PASS margin-top: inherit 
>-PASS margin-bottom: 0px 
>-PASS margin-bottom: 1px 
>-PASS margin-bottom: .1em 
>-PASS margin-bottom: 5% 
>-PASS margin-bottom: .5% 
>-PASS margin-bottom: auto 
>-PASS margin-bottom: inherit 
>-PASS max-height: 0px 
>-PASS max-height: 1px 
>-PASS max-height: .1em 
>-PASS max-height: 5% 
>-PASS max-height: .5% 
>-PASS max-height: none 
>-PASS max-height: inherit 
>-PASS max-width: 0px 
>-PASS max-width: 1px 
>-PASS max-width: .1em 
>-PASS max-width: 5% 
>-PASS max-width: .5% 
>-PASS max-width: none 
>-PASS max-width: inherit 
>-PASS min-height: 0px 
>-PASS min-height: 1px 
>-PASS min-height: .1em 
>-PASS min-height: 5% 
>-PASS min-height: .5% 
>-PASS min-height: inherit 
>-PASS min-width: 0px 
>-PASS min-width: 1px 
>-PASS min-width: .1em 
>-PASS min-width: 5% 
>-PASS min-width: .5% 
>-PASS min-width: inherit 
>-PASS orphans: 101 
>-PASS orphans: inherit 
>-PASS outline-color: black 
>-PASS outline-color: red 
>-PASS outline-color: rgb(50, 75, 100) 
>-FAIL outline-color: rgba(5, 7, 10, 0.5) assert_equals: outline-color raw inline style declaration expected "rgba(5, 7, 10, 0.5)" but got "rgba(5, 7, 10, 0.498039)"
>-FAIL outline-color: invert assert_equals: outline-color raw inline style declaration expected "invert" but got ""
>-PASS outline-color: inherit 
>-PASS outline-style: none 
>-PASS outline-style: dotted 
>-PASS outline-style: dashed 
>-PASS outline-style: solid 
>-PASS outline-style: double 
>-PASS outline-style: groove 
>-PASS outline-style: ridge 
>-PASS outline-style: inset 
>-PASS outline-style: outset 
>-PASS outline-style: inherit 
>-PASS outline-width: thin 
>-PASS outline-width: medium 
>-PASS outline-width: thick 
>-PASS outline-width: 0px 
>-PASS outline-width: 1px 
>-PASS outline-width: .1em 
>-PASS outline-width: inherit 
>-PASS overflow: visible 
>-PASS overflow: hidden 
>-PASS overflow: scroll 
>-PASS overflow: auto 
>-PASS overflow: inherit 
>-PASS padding-top: 0px 
>-PASS padding-top: 1px 
>-PASS padding-top: .1em 
>-PASS padding-top: 5% 
>-PASS padding-top: .5% 
>-PASS padding-top: inherit 
>-PASS padding-right: 0px 
>-PASS padding-right: 1px 
>-PASS padding-right: .1em 
>-PASS padding-right: 5% 
>-PASS padding-right: .5% 
>-PASS padding-right: inherit 
>-PASS padding-bottom: 0px 
>-PASS padding-bottom: 1px 
>-PASS padding-bottom: .1em 
>-PASS padding-bottom: 5% 
>-PASS padding-bottom: .5% 
>-PASS padding-bottom: inherit 
>-PASS padding-left: 0px 
>-PASS padding-left: 1px 
>-PASS padding-left: .1em 
>-PASS padding-left: 5% 
>-PASS padding-left: .5% 
>-PASS padding-left: inherit 
>-FAIL page-break-after: auto assert_equals: page-break-after raw inline style declaration expected "auto" but got ""
>-FAIL page-break-after: always assert_equals: page-break-after raw inline style declaration expected "always" but got ""
>-FAIL page-break-after: avoid assert_equals: page-break-after raw inline style declaration expected "avoid" but got ""
>-FAIL page-break-after: left assert_equals: page-break-after raw inline style declaration expected "left" but got ""
>-FAIL page-break-after: right assert_equals: page-break-after raw inline style declaration expected "right" but got ""
>-PASS page-break-after: inherit 
>-FAIL page-break-before: auto assert_equals: page-break-before raw inline style declaration expected "auto" but got ""
>-FAIL page-break-before: always assert_equals: page-break-before raw inline style declaration expected "always" but got ""
>-FAIL page-break-before: avoid assert_equals: page-break-before raw inline style declaration expected "avoid" but got ""
>-FAIL page-break-before: left assert_equals: page-break-before raw inline style declaration expected "left" but got ""
>-FAIL page-break-before: right assert_equals: page-break-before raw inline style declaration expected "right" but got ""
>-PASS page-break-before: inherit 
>-FAIL page-break-inside: avoid assert_equals: page-break-inside raw inline style declaration expected "avoid" but got ""
>-FAIL page-break-inside: auto assert_equals: page-break-inside raw inline style declaration expected "auto" but got ""
>-PASS page-break-inside: inherit 
>-PASS position: static 
>-PASS position: relative 
>-PASS position: absolute 
>-PASS position: fixed 
>-PASS position: inherit 
>-PASS right: 0px 
>-PASS right: 1px 
>-PASS right: .1em 
>-PASS right: 5% 
>-PASS right: .5% 
>-PASS right: auto 
>-PASS right: inherit 
>-PASS table-layout: auto 
>-PASS table-layout: fixed 
>-PASS table-layout: inherit 
>-PASS text-align: left 
>-PASS text-align: right 
>-PASS text-align: center 
>-PASS text-align: justify 
>-PASS text-align: inherit 
>-PASS text-decoration: none 
>-PASS text-decoration: underline 
>-PASS text-decoration: overline 
>-PASS text-decoration: line-through 
>-PASS text-decoration: blink 
>-PASS text-decoration: inherit 
>-PASS text-indent: 0px 
>-PASS text-indent: 1px 
>-PASS text-indent: .1em 
>-PASS text-indent: 5% 
>-PASS text-indent: .5% 
>-PASS text-indent: inherit 
>-PASS text-transform: capitalize 
>-PASS text-transform: uppercase 
>-PASS text-transform: lowercase 
>-PASS text-transform: none 
>-PASS text-transform: inherit 
>-PASS top: 0px 
>-PASS top: 1px 
>-PASS top: .1em 
>-PASS top: 5% 
>-PASS top: .5% 
>-PASS top: auto 
>-PASS top: inherit 
>-PASS unicode-bidi: normal 
>-PASS unicode-bidi: embed 
>-PASS unicode-bidi: bidi-override 
>-PASS unicode-bidi: inherit 
>-PASS vertical-align: baseline 
>-PASS vertical-align: sub 
>-PASS vertical-align: super 
>-PASS vertical-align: top 
>-PASS vertical-align: text-top 
>-PASS vertical-align: middle 
>-PASS vertical-align: bottom 
>-PASS vertical-align: text-bottom 
>-PASS vertical-align: 5% 
>-PASS vertical-align: .5% 
>-PASS vertical-align: 0px 
>-PASS vertical-align: 1px 
>-PASS vertical-align: .1em 
>-PASS vertical-align: inherit 
>-PASS visibility: visible 
>-PASS visibility: hidden 
>-PASS visibility: collapse 
>-PASS visibility: inherit 
>-PASS white-space: normal 
>-PASS white-space: pre 
>-PASS white-space: nowrap 
>-PASS white-space: pre-wrap 
>-PASS white-space: pre-line 
>-PASS white-space: inherit 
>-PASS widows: 101 
>-PASS widows: inherit 
>-PASS width: 0px 
>-PASS width: 1px 
>-PASS width: .1em 
>-PASS width: 5% 
>-PASS width: .5% 
>-PASS width: auto 
>-PASS width: inherit 
>-PASS word-spacing: normal 
>-PASS word-spacing: 0px 
>-PASS word-spacing: 1px 
>-PASS word-spacing: .1em 
>-PASS word-spacing: inherit 
>-PASS z-index: auto 
>-PASS z-index: 0 
>-PASS z-index: 101 
>-PASS z-index: -51 
>-PASS z-index: inherit 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-values.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-values.html
>deleted file mode 100644
>index 8f6f3d28d03c970decba0366beaff84f96ac348e..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-values.html
>+++ /dev/null
>@@ -1,596 +0,0 @@
>-<!DOCTYPE html>
>-<meta charset="utf-8">
>-<title>CSSOM serialize values</title>
>-<meta name="author" title="Josh Matthews" href="mailto:josh@joshmatthews.net">
>-<script src="/resources/testharness.js"></script>
>-<script src="/resources/testharnessreport.js"></script>
>-<body>
>-  <div id="log"></div>
>-  <div id="parent"></div>
>-  <script>
>-    function iterable(values) {
>-      var i = 0;
>-      return function() {
>-        if (i < values.length) {
>-          return values[i++];
>-        }
>-        return null;
>-      }
>-    }
>-
>-    function color() {
>-      var colors = ['black', 'red', 'rgb(50, 75, 100)', 'rgba(5, 7, 10, 0.5)'];
>-      return iterable(colors);
>-    }
>-
>-    function percentage() {
>-      var values = ["5%", {actual: ".5%", serialized: "0.5%"}];
>-      return iterable(values);
>-    }
>-
>-    function negative_percentage() {
>-      var values = ["-5%", {actual: "-.5%", serialized: "-0.5%"}];
>-      return iterable(values);
>-    }
>-
>-    function length() {
>-      var values = ["0px", "1px", {actual: ".1em", serialized: "0.1em"}];
>-      return iterable(values);
>-    }
>-
>-    function negative_length() {
>-      var values = [{actual: "-0px", serialized: "0px"},
>-                    "-1px", {actual: "-.1em", serialized: "-0.1em"}];
>-      return iterable(values);
>-    }
>-
>-    function degree() {
>-      var values = ["87deg"];
>-      return iterable(values);
>-    }
>-
>-    function uri() {
>-      var values = ["url(\"http://localhost/\")",
>-        {actual: "url(http://localhost/)",
>-         serialized: "url(\"http://localhost/\")"}];
>-      return iterable(values);
>-    }
>-
>-    function border_style() {
>-      var values = ['none', 'hidden', 'dotted', 'dashed', 'solid', 'double', 'groove', 'ridge',
>-                    'inset', 'outset'];
>-      return iterable(values);
>-    }
>-
>-    function border_style_without_hidden() {
>-      var values = ['none', 'dotted', 'dashed', 'solid', 'double', 'groove', 'ridge',
>-                    'inset', 'outset'];
>-      return iterable(values);
>-    }
>-
>-    function integer() {
>-      var values = ['0', '101', '-51'];
>-      return iterable(values);
>-    }
>-
>-    function nonzero_positive_integer() {
>-      var values = ['101'];
>-      return iterable(values);
>-    }
>-
>-    function shape() {
>-      var values = ['rect(1em, auto, 0.5px, 2000em)'];
>-      return iterable(values);
>-    }
>-
>-    function string() {
>-      var values = ['"string"', {actual: "'string'", serialized: '"string"'}];
>-      return iterable(values);
>-    }
>-
>-    function counter() {
>-      var values = [{actual: 'counter(par-num)',
>-                     serialized: 'counter(par-num, decimal)'},
>-                    'counter(par-num, upper-roman)'];
>-      return iterable(values);
>-    }
>-
>-    function attr() {
>-      var values = ['attr(foo-bar)', 'attr(foo_bar)'];
>-      return iterable(values);
>-    }
>-
>-    function family_name() {
>-      var values = ['Arial', {actual: "'Lucida Grande'", serialized: '"Lucida Grande"'}];
>-      return iterable(values);
>-    }
>-
>-    function generic_family() {
>-      var values = ['serif', 'sans-serif'];
>-      return iterable(values);
>-    }
>-
>-    function absolute_size() {
>-      var values = ['xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large'];
>-      return iterable(values);
>-    }
>-
>-    function relative_size() {
>-      var values = ['larger', 'smaller'];
>-      return iterable(values);
>-    }
>-
>-    function number() {
>-      var values = ['0', {'actual': '-0', serialized: '0'}, '1000', '-5123', '0.9', '-0.09'];
>-      return iterable(values);
>-    }
>-
>-    function positive_number() {
>-      var values = ['0', {'actual': '-0', serialized: '0'}, '1000', '0.9'];
>-      return iterable(values);
>-    }
>-
>-    function generate_inline_style(name, value) {
>-      if (value) {
>-        return {'declaration': name + ": " + value.actual,
>-                'value': value.actual,
>-                'result': value.expected};
>-      }
>-      return null;
>-    }
>-
>-    function create_result(actual, expected) {
>-      return {actual: actual, expected: expected}
>-    }
>-
>-    function all_values(values) {
>-      var results = [];
>-      for (var i = 0; i < values.length; i++) {
>-        var value = values[i];
>-        if (typeof value == "function") {
>-          var f = value();
>-          var result;
>-          while ((result = f()) != null) {
>-            if (typeof result == "object" && 'serialized' in result) {
>-              results.push(create_result(result.actual, result.serialized));
>-            } else {
>-              results.push(create_result(result, result));
>-            }
>-          }
>-        } else if (typeof value == "string") {
>-          results.push(create_result(value, value));
>-        } else if (value instanceof Array) {
>-          var subresults = [];
>-          for (var j = 0; j < value.length; j++) {
>-            var subresult = all_values(value[j], true);
>-            if (!(subresult instanceof Array)) {
>-              subresult = [subresult];
>-            }
>-            subresults.push(subresult);
>-          }
>-          if (subresults.length > 1) {
>-            function choose_slices(vecs) {
>-              if (vecs.length == 1) {
>-                return vecs[0].map(function(v) { return [v]; });
>-              }
>-              var slice_results = [];
>-              var rest = choose_slices(vecs.slice(1, vecs.length));
>-              for (var a = 0; a < vecs[0].length; a++) {
>-                for (var b = 0; b < rest.length; b++) {
>-                  var result = vecs[0][a];
>-                  slice_results.push([result].concat(rest[b]));
>-                }
>-              }
>-              return slice_results;
>-            }
>-
>-            subresults = choose_slices(subresults).map(function (a) {
>-              var actual = a.map(function(a) { return a.actual });
>-              var expected = a.map(function(a) { return a.expected });
>-              return create_result(actual.join(' '), expected.join(' '))
>-            });
>-          }
>-          for (var j = 0; j < subresults.length; j++) {
>-            results = results.concat(subresults[j]);
>-          }
>-        } else if (value instanceof Object && 'serialized' in value) {
>-          results.push(create_result(value.actual, value.serialized));
>-        } else if (typeof value == "number") {
>-          results.push(create_result(value.toString(), value.toString()));
>-        } else {
>-          throw "unexpected value type: " + typeof(value);
>-        }
>-      }
>-      return results;
>-    }
>-
>-    function create_value_generator(property) {
>-      var results = all_values(property.values);
>-      return iterable(results);
>-    }
>-
>-    function to_idl(property) {
>-      return property.replace(/-\w/g, function(x){return x[1].toUpperCase()});
>-    }
>-
>-    function run_individual_test(property, generator, initial) {
>-      var elem = document.createElement('div');
>-      document.getElementById('parent').appendChild(elem);
>-      var test_data = generator();
>-      var style = generate_inline_style(property, test_data);
>-      if (!style) {
>-        return false;
>-      }
>-      var t = async_test(style.declaration);
>-
>-      t.add_cleanup(function() {
>-        document.getElementById('parent').removeChild(elem);
>-      });
>-
>-      t.step(function() {
>-        elem.setAttribute('style', style.declaration);
>-        var expected = style.result;
>-        var serialized = elem.style[to_idl(property)];
>-        assert_equals(serialized, expected, property + ' raw inline style declaration');
>-        elem.setAttribute('style', '');
>-        elem.style[to_idl(property)] = style.value;
>-        assert_equals(elem.style[to_idl(property)], expected, property + ' style property');
>-      });
>-      t.done();
>-      return true;
>-    }
>-
>-    function test_property(property) {
>-      var generator = create_value_generator(property[1]);
>-      while (run_individual_test(property[0], generator, property[1].initial)) {
>-      }
>-    }
>-
>-    var properties = [
>-      ['background-attachment', {
>-        'values': ['scroll', 'fixed', 'inherit'],
>-        'initial': 'scroll',
>-      }],
>-      ['background-color', {
>-        'values': [color, 'transparent', 'inherit'],
>-        'initial': 'transparent',
>-      }],
>-      ['background-image', {
>-        'values': [uri, 'none', 'inherit'],
>-        'initial': 'none',
>-      }],
>-      ['background-position', {
>-        'values': [[[percentage, negative_percentage, length, negative_length,
>-                     'left', 'center', 'right'],
>-                    [percentage, negative_percentage, length, negative_length,
>-                     'top', 'center', 'bottom']],
>-                   'inherit'],
>-        'initial': '0% 0%',
>-      }],
>-      ['background-repeat', {
>-        'values': ['repeat', 'repeat-x', 'repeat-y', 'no-repeat', 'inherit'],
>-        'initial': 'repeat',
>-      }],
>-      //background
>-      ['border-collapse', {
>-        'values': ['collapse', 'separate', 'inherit'],
>-        'initial': 'separate',
>-      }],
>-      //border-color
>-      ['border-spacing', {
>-        'values': [length, 'inherit'],
>-        'initial': '0',
>-      }],
>-      //border-style
>-      //border-top, border-right, border-bottom, border-left
>-      ['border-top-color', {
>-        'values': [color, 'transparent', 'inherit'],
>-        'initial': 'black', //FIXME
>-      }],
>-      ['border-right-color', {
>-        'values': [color, 'transparent', 'inherit'],
>-        'initial': 'black', //FIXME
>-      }],
>-      ['border-bottom-color', {
>-        'values': [color, 'transparent', 'inherit'],
>-        'initial': 'black', //FIXME
>-      }],
>-      ['border-left-color', {
>-        'values': [color, 'transparent', 'inherit'],
>-        'initial': 'black', //FIXME
>-      }],
>-      ['border-top-style', {
>-        'values': [border_style, 'inherit'],
>-        'initial': null,
>-      }],
>-      ['border-right-style', {
>-        'values': [border_style, 'inherit'],
>-        'initial': null,
>-      }],
>-      ['border-bottom-style', {
>-        'values': [border_style, 'inherit'],
>-        'initial': null,
>-      }],
>-      ['border-left-style', {
>-        'values': [border_style, 'inherit'],
>-        'initial': null,
>-      }],
>-      ['border-top-width', {
>-        'values': ['thin', 'medium', 'thick', length, 'inherit'],
>-        'initial': 'medium',
>-      }],
>-      ['border-right-width', {
>-        'values': ['thin', 'medium', 'thick', length, 'inherit'],
>-        'initial': 'medium',
>-      }],
>-      ['border-bottom-width', {
>-        'values': ['thin', 'medium', 'thick', length, 'inherit'],
>-        'initial': 'medium',
>-      }],
>-      ['border-left-width', {
>-        'values': ['thin', 'medium', 'thick', length, 'inherit'],
>-        'initial': 'medium',
>-      }],
>-      //border-width
>-      //border
>-      ['bottom', {
>-        'values': [length, percentage, 'auto', 'inherit'],
>-        'initial': 'auto',
>-      }],
>-      ['caption-side', {
>-        'values': ['top', 'bottom', 'inherit'],
>-        'initial': 'top',
>-      }],
>-      ['clear', {
>-        'values': ['none', 'left', 'right', 'both', 'inherit'],
>-        'initial': 'none',
>-      }],
>-      ['clip', {
>-        'values': [shape, 'auto', 'inherit'],
>-        'initial': 'auto',
>-      }],
>-      ['color', {
>-        'values': [color, 'inherit'],
>-        'initial': 'black', //FIXME depends on user agent
>-      }],
>-      ['content', {
>-        'values': ['normal', 'none', string, uri, counter, attr, 'inherit'], //FIXME
>-        'initial': 'normal',
>-      }],
>-      //counter-increment
>-      //counter-reset
>-      ['cursor', {
>-        'values': [ 'auto', 'crosshair', 'default', 'pointer', 'move', 'e-resize', 'ne-resize',
>-                    'nw-resize', 'n-resize', 'se-resize', 'sw-resize', 's-resize', 'w-resize',
>-                    'text', 'wait', 'help', 'progress', 'inherit'],
>-        'initial': 'auto',
>-      }],
>-      ['direction', {
>-        'values': ['ltr', 'rtl', 'inherit'],
>-        'initial': 'ltr',
>-      }],
>-      ['display', {
>-        'values': ['inline', 'block', 'list-item', 'inline-block', 'table', 'inline-table',
>-                   'table-row-group', 'table-header-group', 'table-footer-group', 'table-row',
>-                   'table-column-group', 'table-column', 'table-cell', 'table-caption', 'none',
>-                   'inherit'],
>-        'initial': 'inline',
>-      }],
>-      ['empty-cells', {
>-         'values': ['show', 'hide', 'inherit'],
>-         'initial': 'show',
>-      }],
>-      ['float', {
>-        'values': ['left', 'right', 'none', 'inherit'],
>-        'initial': 'none',
>-        'property': 'cssFloat',
>-      }],
>-      ['font-family', {
>-        'values': [family_name, generic_family, 'inherit'],
>-        'initial': 'sans-serif', //FIXME depends on user agent
>-      }],
>-      ['font-size', {
>-        'values': [absolute_size, relative_size, length, percentage, 'inherit'],
>-        'initial': 'medium',
>-      }],
>-      ['font-style', {
>-        'values': ['normal', 'italic', 'oblique', 'inherit'],
>-        'initial': 'normal',
>-      }],
>-      ['font-variant', {
>-        'values': ['normal', 'small-caps', 'inherit'],
>-        'initial': 'normal',
>-      }],
>-      ['font-weight', {
>-        'values': ['normal', 'bold', 'bolder', 'lighter', 100, 200, 300, 400, 500, 600,
>-                   700, 800, 900, 'inherit'],
>-        'initial': 'normal',
>-      }],
>-      //font
>-      ['height', {
>-        'values': [length, percentage, 'auto', 'inherit'],
>-        'initial': 'auto',
>-      }],
>-      ['left', {
>-        'values': [length, percentage, 'auto', 'inherit'],
>-        'initial': 'auto',
>-      }],
>-      ['letter-spacing', {
>-        'values': ['normal', length, 'inherit'],
>-        'initial': 'normal',
>-      }],
>-      ['line-height', {
>-        'values': ['normal', positive_number, length, percentage, 'inherit'],
>-        'initial': 'normal',
>-      }],
>-      ['list-style-image', {
>-        'values': [uri, 'none', 'inherit'],
>-        'initial': 'none',
>-      }],
>-      ['list-style-position', {
>-        'values': ['inside', 'outside', 'inherit'],
>-        'initial': 'outside',
>-      }],
>-      ['list-style-type', {
>-        'values': ['disc', 'circle', 'square', 'decimal', 'decimal-leading-zero', 'lower-roman',
>-                   'upper-roman', 'lower-greek', 'lower-latin', 'upper-latin', 'armenian', 'georgian',
>-                   'lower-alpha', 'upper-alpha', 'none', 'inherit'],
>-        'initial': 'disc',
>-      }],
>-      //list-style
>-      ['margin-right', {
>-        'values': [length, percentage, 'auto', 'inherit'],
>-        'initial': 0,
>-      }],
>-      ['margin-left', {
>-        'values': [length, percentage, 'auto', 'inherit'],
>-        'initial': 0,
>-      }],
>-      ['margin-top', {
>-        'values': [length, percentage, 'auto', 'inherit'],
>-        'initial': 0,
>-      }],
>-      ['margin-bottom', {
>-        'values': [length, percentage, 'auto', 'inherit'],
>-        'initial': 0,
>-      }],
>-      //margin
>-      ['max-height', {
>-        'values': [length, percentage, 'none', 'inherit'],
>-        'initial': 'none',
>-      }],
>-      ['max-width', {
>-        'values': [length, percentage, 'none', 'inherit'],
>-        'initial': 'none',
>-      }],
>-      ['min-height', {
>-        'values': [length, percentage, 'inherit'],
>-        'initial': 0,
>-      }],
>-      ['min-width', {
>-        'values': [length, percentage, 'inherit'],
>-        'initial': 0,
>-      }],
>-      ['orphans', {
>-        'values': [nonzero_positive_integer, 'inherit'],
>-        'initial': 2,
>-      }],
>-      ['outline-color', {
>-        'values': [color, 'invert', 'inherit'],
>-        'initial': 'invert',
>-      }],
>-      ['outline-style', {
>-        'values': [border_style_without_hidden, 'inherit'],
>-        'initial': 'none',
>-      }],
>-      ['outline-width', {
>-        'values': ['thin', 'medium', 'thick', length, 'inherit'],
>-        'initial': 'medium',
>-      }],
>-      //outline
>-      ['overflow', {
>-        'values': ['visible', 'hidden', 'scroll', 'auto', 'inherit'],
>-        'initial': 'visible',
>-      }],
>-      ['padding-top', {
>-        'values': [length, percentage, 'inherit'],
>-        'initial': 0,
>-      }],
>-      ['padding-right', {
>-        'values': [length, percentage, 'inherit'],
>-        'initial': 0,
>-      }],
>-      ['padding-bottom', {
>-        'values': [length, percentage, 'inherit'],
>-        'initial': 0,
>-      }],
>-      ['padding-left', {
>-        'values': [length, percentage, 'inherit'],
>-        'initial': 0,
>-      }],
>-      //padding
>-      ['page-break-after', {
>-        'values': ['auto', 'always', 'avoid', 'left', 'right', 'inherit'],
>-        'initial': 'auto',
>-      }],
>-      ['page-break-before', {
>-        'values': ['auto', 'always', 'avoid', 'left', 'right', 'inherit'],
>-        'initial': 'auto',
>-      }],
>-      ['page-break-inside', {
>-        'values': ['avoid', 'auto', 'inherit'],
>-        'initial': 'auto',
>-      }],
>-      ['position', {
>-        'values': ['static', 'relative', 'absolute', 'fixed', 'inherit'],
>-        'initial': 'static',
>-      }],
>-      //FIXME quotes
>-      ['right', {
>-        'values': [length, percentage, 'auto', 'inherit'],
>-        'initial': 'auto',
>-      }],
>-      ['table-layout', {
>-        'values': ['auto', 'fixed', 'inherit'],
>-        'initial': 'auto',
>-      }],
>-      ['text-align', {
>-        'values': ['left', 'right', 'center', 'justify', 'inherit'],
>-        'initial': null,
>-      }],
>-      ['text-decoration', {
>-        'values': ['none', 'underline', 'overline', 'line-through', 'blink', 'inherit'],
>-        'initial': 'none',
>-      }],
>-      ['text-indent', {
>-        'values': [length, percentage, 'inherit'],
>-        'initial': 0,
>-      }],
>-      ['text-transform', {
>-        'values': ['capitalize', 'uppercase', 'lowercase', 'none', 'inherit'],
>-        'initial': 'none',
>-      }],
>-      ['top', {
>-        'values': [length, percentage, 'auto', 'inherit'],
>-        'initial': 'auto',
>-      }],
>-      ['unicode-bidi', {
>-        'values': ['normal', 'embed', 'bidi-override', 'inherit'],
>-        'initial': 'normal',
>-      }],
>-      ['vertical-align', {
>-        'values': ['baseline', 'sub', 'super', 'top', 'text-top', 'middle', 'bottom', 'text-bottom',
>-                   percentage, length, 'inherit'],
>-        'initial': 'baseline',
>-      }],
>-      ['visibility', {
>-        'values': ['visible', 'hidden', 'collapse', 'inherit'],
>-        'initial': 'visible',
>-      }],
>-      ['white-space', {
>-        'values': ['normal', 'pre', 'nowrap', 'pre-wrap', 'pre-line', 'inherit'],
>-        'initial': 'normal',
>-      }],
>-      ['widows', {
>-        'values': [nonzero_positive_integer, 'inherit'],
>-        'initial': 2,
>-      }],
>-      ['width', {
>-        'values': [length, percentage, 'auto', 'inherit'],
>-        'initial': 'auto',
>-      }],
>-      ['word-spacing', {
>-        'values': ['normal', length, 'inherit'],
>-        'initial': 'normal',
>-      }],
>-      ['z-index', {
>-        'values': ['auto', integer, 'inherit'],
>-        'initial': 'auto',
>-      }],
>-    ]
>-
>-    for (var index = 0; index < properties.length; index++) {
>-      test_property(properties[index]);
>-    }
>-  </script>
>-</body>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-variable-reference-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-variable-reference-expected.txt
>deleted file mode 100644
>index 1d31a15e7c8001a439348d1490cc4f4e6c3c0a92..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-variable-reference-expected.txt
>+++ /dev/null
>@@ -1,6 +0,0 @@
>-
>-PASS Longhand with variable preserves original serialization: with withespace 
>-PASS Shorthand with variable preserves original serialization: with withespace 
>-FAIL Longhand with variable preserves original serialization: without withespace assert_equals: expected "font-size:var(--a);" but got "font-size: var(--a);"
>-FAIL Shorthand with variable preserves original serialization: without withespace assert_equals: expected "font:var(--a);" but got "font: var(--a);"
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-variable-reference.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-variable-reference.html
>deleted file mode 100644
>index d714b81518b362aa6e9209ce2b57d2faa05b2bac..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-variable-reference.html
>+++ /dev/null
>@@ -1,34 +0,0 @@
>-<!doctype html>
>-<meta charset="utf-8">
>-<title>CSSOM - Serialization with variable preserves original serialization.</title>
>-<script src="/resources/testharness.js"></script>
>-<script src="/resources/testharnessreport.js"></script>
>-<div id="longhand-whitespace" style="font-size: var(--a);"></div>
>-<div id="shorthand-whitespace" style="font: var(--a);"></div>
>-<div id="longhand" style="font-size:var(--a);"></div>
>-<div id="shorthand" style="font:var(--a);"></div>
>-<script>
>-    test(function() {
>-        var elem = document.getElementById('longhand-whitespace');
>-
>-        assert_equals(elem.style.cssText, 'font-size: var(--a);');
>-    }, 'Longhand with variable preserves original serialization: with withespace')
>-
>-    test(function() {
>-        var elem = document.getElementById('shorthand-whitespace');
>-
>-        assert_equals(elem.style.cssText, 'font: var(--a);');
>-    }, 'Shorthand with variable preserves original serialization: with withespace')
>-
>-    test(function() {
>-        var elem = document.getElementById('longhand');
>-
>-        assert_equals(elem.style.cssText, 'font-size:var(--a);');
>-    }, 'Longhand with variable preserves original serialization: without withespace')
>-
>-    test(function() {
>-        var elem = document.getElementById('shorthand');
>-
>-        assert_equals(elem.style.cssText, 'font:var(--a);');
>-    }, 'Shorthand with variable preserves original serialization: without withespace')
>-</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/shorthand-serialization-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/shorthand-serialization-expected.txt
>deleted file mode 100644
>index d1f00505996e44f2f63786e2e7bc4903a090f9ba..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/shorthand-serialization-expected.txt
>+++ /dev/null
>@@ -1,12 +0,0 @@
>-foo
>-foo
>-foo
>-foo
>-foo
>-foo
>-foo
>-
>-PASS Shorthand serialization with shorthand and longhands mixed. 
>-PASS Shorthand serialization with just longhands. 
>-FAIL Shorthand serialization with variable and variable from other shorthand. assert_equals: expected "var(--a)" but got ""
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/shorthand-serialization.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/shorthand-serialization.html
>deleted file mode 100644
>index c34b1652626c9a08d9bc72148853805eb0afdc97..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/shorthand-serialization.html
>+++ /dev/null
>@@ -1,53 +0,0 @@
>-<!doctype html>
>-<html>
>-<head>
>-    <meta charset="utf-8">
>-    <title>Shorthand serialization should be done correctly.</title>
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-</head>
>-<body>
>-    <div id="foo1" style="background: red;">foo</div>
>-    <div id="foo2" style="background-color: blue; background: red !important; background-color: green;">foo</div>
>-    <div id="foo3" style="background-color: blue; background: red; background-color: green !important;">foo</div>
>-
>-    <div id="foo4" style="margin-right: 10px; margin-left: 10px; margin-top: 10px; margin-bottom: 10px;">foo</div>
>-    <div id="foo5" style="margin-right: 10px; margin-left: 10px; margin-top: 10px; margin-bottom: 10px!important;">foo</div>
>-    <div id="foo6" style="margin-right: 10px !important; margin-left: 10px !important; margin-top: 10px !important; margin-bottom: 10px!important;">foo</div>
>-
>-    <div id="foo7" style="background:var(--a);">foo</a>
>-
>-    <script>
>-        test(function() {
>-            var elem1 = document.getElementById('foo1');
>-            var elem2 = document.getElementById('foo2');
>-            var elem3 = document.getElementById('foo3');
>-
>-            assert_false(elem1.style.cssText.endsWith('!important;'));
>-            assert_true(elem2.style.cssText.endsWith('!important;'));
>-            assert_false(elem3.style.background.endsWith('!important'));
>-
>-        }, "Shorthand serialization with shorthand and longhands mixed.");
>-
>-        test(function() {
>-            var elem4 = document.getElementById('foo4');
>-            var elem5 = document.getElementById('foo5');
>-            var elem6 = document.getElementById('foo6');
>-
>-            assert_equals(elem4.style.cssText, 'margin: 10px;');
>-            assert_equals(elem4.style.margin, '10px');
>-            assert_equals(elem5.style.cssText, 'margin-right: 10px; margin-left: 10px; margin-top: 10px; margin-bottom: 10px !important;');
>-            assert_equals(elem5.style.margin, '');
>-            assert_equals(elem6.style.cssText, 'margin: 10px !important;');
>-            assert_equals(elem6.style.margin, '10px');
>-        }, "Shorthand serialization with just longhands.");
>-
>-        test(function() {
>-          var elem7 = document.getElementById('foo7');
>-
>-          assert_equals(elem7.style.background, 'var(--a)');
>-          assert_equals(elem7.style.backgroundPosition, '');
>-        }, "Shorthand serialization with variable and variable from other shorthand.");
>-    </script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-001-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-001-expected.txt
>deleted file mode 100644
>index e6930178e3634f3571b828f50af67508f004b960..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-001-expected.txt
>+++ /dev/null
>@@ -1,8 +0,0 @@
>-
>-FAIL sheet_property assert_own_property: expected property "sheet" missing
>-PASS sheet_property_updates 
>-FAIL CSSStyleSheet_properties undefined is not an object (evaluating 'object.hasOwnProperty')
>-FAIL CSSStyleSheet_property_values undefined is not an object (evaluating 'styleSheet.ownerRule')
>-FAIL StyleSheet_properties undefined is not an object (evaluating 'object.hasOwnProperty')
>-FAIL StyleSheet_property_values undefined is not an object (evaluating 'styleSheet.type')
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-001.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-001.html
>deleted file mode 100644
>index fb1fde86efff626fadff20ceaa01938ce6bc52c4..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-001.html
>+++ /dev/null
>@@ -1,139 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>- <head>
>-  <title>CSS Test: CSSOM StyleSheet Initial Values</title>
>-  <link rel="author" title="Bear Travis" href="mailto:betravis@adobe.com">
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-style-sheets">
>-  <meta name="flags" content="dom">
>-  <meta name="assert" content="StyleSheet and CSSStyleSheet objects have the properties specified in their interfaces">
>-  <script src="/resources/testharness.js" type="text/javascript"></script>
>-  <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>-  <style id="styleElement" type="text/css" media="all" title="internal style sheet" disabled="disabled">
>-    @import url('support/a-green.css');
>-    * { margin: 0; padding: 0; }
>-  </style>
>-  <link id="linkElement" rel="stylesheet" href="support/b-green.css">
>-<script id="metadata_cache">/*
>-{
>-  "sheet_property": {
>-    "help": "http://www.w3.org/TR/cssom-1/#the-linkstyle-interface",
>-    "assert": ["styleElement.sheet exists",
>-               "styleElement.sheet is a CSSStyleSheet",
>-               "linkElement.sheet exists",
>-               "linkElement.sheet is a CSSStyleSheet"]
>-  },
>-  "CSSStyleSheet_properties": {
>-    "assert": ["ownerRule, cssRules, insertRule and deleteRule properties exist on CSSStyleSheet",
>-               "ownerRule, cssRules are read only"]
>-  },
>-  "CSSStyleSheet_property_values": {
>-    "help": ["http://www.w3.org/TR/cssom-1/#css-style-sheets",
>-             "http://www.w3.org/TR/cssom-1/#cssimportrule"],
>-    "assert": "CSSStyleSheet initial property values are correct"
>-  },
>-  "StyleSheet_properties": {
>-    "assert": ["type, disabled, ownerNode, parentStyleSheet, href, title, and media properties exist on StyleSheet",
>-               "type, ownerNode, parentStyleSheet, href, title, media properties are read only"]
>-  },
>-  "StyleSheet_property_values": { "assert": "StyleSheet initial property values are correct" }
>-}
>-*/</script>
>- </head>
>- <body>
>-  <noscript>Test not run - javascript required.</noscript>
>-  <div id="log"></div>
>-  <script type="text/javascript">
>-    var styleElement = document.getElementById("styleElement");
>-    var linkElement = document.getElementById("linkElement");
>-
>-    var styleSheet;
>-    var linkSheet;
>-    test(function() {
>-        assert_own_property(styleElement, "sheet");
>-        assert_readonly(styleElement, "sheet");
>-        styleSheet = styleElement.sheet;
>-        assert_true(styleSheet instanceof CSSStyleSheet);
>-        assert_own_property(linkElement, "sheet");
>-        linkSheet = linkElement.sheet;
>-        assert_true(linkSheet instanceof CSSStyleSheet);
>-    }, "sheet_property",
>-    { help: "http://www.w3.org/TR/cssom-1/#the-linkstyle-interface",
>-      assert: [ "styleElement.sheet exists", "styleElement.sheet is a CSSStyleSheet",
>-                "linkElement.sheet exists", "linkElement.sheet is a CSSStyleSheet"] });
>-
>-    test(function () {
>-      var style = document.createElement("style");
>-      document.querySelector("head").appendChild(style);
>-      var sheet1 = style.sheet;
>-      assert_equals(sheet1.cssRules.length, 0);
>-      style.appendChild(document.createTextNode("a { color: green; }"));
>-      assert_equals(style.sheet.cssRules.length, 1);
>-    }, "sheet_property_updates",
>-    { help: "https://www.w3.org/TR/cssom-1/#the-linkstyle-interface",
>-      assert: "The sheet property on LinkStyle should always return the current associated style sheet." });
>-
>-    test(function() {
>-        assert_own_property(styleSheet, "ownerRule");
>-        assert_own_property(styleSheet, "cssRules");
>-        assert_inherits(styleSheet, "insertRule");
>-        assert_inherits(styleSheet, "deleteRule");
>-
>-        assert_readonly(styleSheet, "ownerRule");
>-        assert_readonly(styleSheet, "cssRules");
>-    }, "CSSStyleSheet_properties",
>-    { assert: [ "ownerRule, cssRules, insertRule and deleteRule properties exist on CSSStyleSheet",
>-                "ownerRule, cssRules are read only"] });
>-
>-    var importSheet;
>-    test(function() {
>-        assert_equals(styleSheet.ownerRule, null);
>-        assert_true(styleSheet.cssRules.length > 0);
>-        assert_true(styleSheet.cssRules.item(0) instanceof CSSImportRule);
>-        importSheet = styleSheet.cssRules.item(0).styleSheet;
>-    }, "CSSStyleSheet_property_values",
>-    { help: [ "http://www.w3.org/TR/cssom-1/#css-style-sheets",
>-              "http://www.w3.org/TR/cssom-1/#cssimportrule" ],
>-      assert: "CSSStyleSheet initial property values are correct" });
>-
>-    test(function() {
>-        assert_own_property(styleSheet, "type");
>-        assert_own_property(styleSheet, "disabled");
>-        assert_own_property(styleSheet, "ownerNode");
>-        assert_own_property(styleSheet, "parentStyleSheet");
>-        assert_own_property(styleSheet, "href");
>-        assert_own_property(styleSheet, "title");
>-        assert_own_property(styleSheet, "media");
>-
>-        assert_readonly(styleSheet, "type");
>-        assert_readonly(styleSheet, "ownerNode");
>-        assert_readonly(styleSheet, "parentStyleSheet");
>-        assert_readonly(styleSheet, "href");
>-        assert_readonly(styleSheet, "title");
>-        assert_readonly(styleSheet, "media");
>-    }, "StyleSheet_properties",
>-    { assert: [ "type, disabled, ownerNode, parentStyleSheet, href, title, and media properties exist on StyleSheet",
>-                "type, ownerNode, parentStyleSheet, href, title, media properties are read only" ] });
>-
>-    test(function() {
>-        assert_equals(styleSheet.type, "text/css");
>-        assert_equals(styleSheet.disabled, false);
>-
>-        assert_equals(styleSheet.ownerNode, styleElement);
>-        assert_equals(linkSheet.ownerNode, linkElement);
>-        assert_equals(importSheet.ownerNode, null);
>-
>-        assert_equals(styleSheet.href, null);
>-        assert_regexp_match(linkSheet.href, /support\/b-green.css$/);
>-        assert_regexp_match(importSheet.href, /support\/a-green.css$/);
>-
>-        assert_equals(styleSheet.parentStyleSheet, null);
>-        assert_equals(linkSheet.parentStyleSheet, null);
>-        assert_equals(importSheet.parentStyleSheet, styleSheet);
>-
>-        assert_equals(styleSheet.title, "internal style sheet");
>-        assert_equals(styleSheet.media.item(0), "all");
>-    }, "StyleSheet_property_values",
>-    { assert: "StyleSheet initial property values are correct" });
>-  </script>
>- </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-002-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-002-expected.txt
>deleted file mode 100644
>index 4b53120569b32912dfa7b7b40866ab7a5d60c952..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-002-expected.txt
>+++ /dev/null
>@@ -1,4 +0,0 @@
>-
>-PASS add_rule 
>-PASS delete_rule 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-002.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-002.html
>deleted file mode 100644
>index 08b0370c24dad1c0a30d0c87801c979090c5200f..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-002.html
>+++ /dev/null
>@@ -1,51 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>- <head>
>-  <title>CSS Test: CSSOM StyleSheet Modify Rule List</title>
>-  <link rel="author" title="Bear Travis" href="mailto:betravis@adobe.com">
>-  <link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> 
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstylesheet-interface">
>-  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
>-  <meta name="flags" content="dom">
>-  <meta name="assert" content="StyleSheet and CSSStyleSheet objects have the properties specified in their interfaces">
>-  <script src="/resources/testharness.js" type="text/javascript"></script>
>-  <script src="/resources/testharnessreport.js" type="text/javascript"></script>
>-  <style id="styleElement" type="text/css" media="all" title="internal style sheet" disabled="disabled">
>-    * { margin: 0; padding: 0; }
>-  </style>
>-  <script id="metadata_cache">/*
>-{
>-  "add_rule": {
>-    "assert": ["Initial rule list is of size 1",
>-               "Can add a rule at first index"]
>-  },
>-  "delete_rule": { "assert": "Can delete rules until rule list is empty" }
>-}
>-*/</script>
>- </head>
>- <body>
>-  <noscript>Test not run - javascript required.</noscript>
>-  <div id="log"></div>
>-  <script type="text/javascript">
>-  var sheet = document.getElementById("styleElement").sheet;
>-  test(function() {
>-    assert_equals(sheet.cssRules.length, 1);
>-    sheet.insertRule("p { color: green; }", 0);
>-    assert_equals(sheet.cssRules.length, 2);
>-    assert_equals(sheet.cssRules.item(0).cssText, "p { color: green; }");
>-  }, "add_rule", {
>-    assert: [   "Initial rule list is of size 1",
>-                "Can add a rule at first index" ]
>-  });
>-
>-  test(function() {
>-    sheet.deleteRule(0);
>-    assert_equals(sheet.cssRules.length, 1);
>-    sheet.deleteRule(0);
>-    assert_equals(sheet.cssRules.length, 0);
>-  }, "delete_rule", {
>-    assert: "Can delete rules until rule list is empty"
>-  });
>-  </script>
>- </body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.css b/LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.css
>deleted file mode 100644
>index d61a8dd67c9e74e7ca620f08dc1bd2ed1998fa8f..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.css
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-body {
>-    padding: 10px;
>-}
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.sub-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.sub-expected.txt
>deleted file mode 100644
>index 1616078928abb11fb59f76b186a045ce7b906b2d..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.sub-expected.txt
>+++ /dev/null
>@@ -1,9 +0,0 @@
>-Blocked access to external URL http://www1.localhost:8801/stylesheet-same-origin.css
>-Blocked access to external URL http://www1.localhost:8801/stylesheet-same-origin.css
>-
>-FAIL Origin-clean check in cross-origin CSSOM Stylesheets assert_throws: Cross origin stylesheet.cssRules should throw SecurityError. function "function () {
>-                    crossorigin.cssRules;
>-                }" threw object "TypeError: null is not an object (evaluating 'crossorigin.cssRules')" that is not a DOMException SecurityError: property "code" is equal to undefined, expected 18
>-PASS Origin-clean check in same-origin CSSOM Stylesheets 
>-FAIL Origin-clean check in data:css CSSOM Stylesheets null is not an object (evaluating 'sheet.cssRules.length')
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.sub.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.sub.html
>deleted file mode 100644
>index 9df0a54b7d8524176a9ff1289f8d4275035d835b..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.sub.html
>+++ /dev/null
>@@ -1,56 +0,0 @@
>-<!doctype html>
>-<html>
>-<head>
>-    <meta charset="utf-8">
>-    <title>CSSOM - CSSStylesheet should support origins</title>
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-
>-    <link id="crossorigin" href="http://www1.{{host}}:{{ports[http][1]}}/stylesheet-same-origin.css" rel="stylesheet">
>-    <link id="sameorigin" href="stylesheet-same-origin.css" rel="stylesheet">
>-    <link id="sameorigindata" href="data:text/css,.green-text{color:rgb(0, 255, 0)}" rel="stylesheet">
>-
>-    <script>
>-        var crossorigin = document.getElementById("crossorigin").sheet;
>-        var sameorigin = document.getElementById("sameorigin").sheet;
>-        var sameorigindata = document.getElementById("sameorigindata").sheet;
>-
>-        test(function() {
>-            assert_throws("SecurityError",
>-                function () {
>-                    crossorigin.cssRules;
>-                },
>-                "Cross origin stylesheet.cssRules should throw SecurityError.");
>-            assert_throws("SecurityError",
>-                function () {
>-                    crossorigin.insertRule("#test { margin: 10px; }", 1);
>-                },
>-                "Cross origin stylesheet.insertRule should throw SecurityError.");
>-
>-            assert_throws("SecurityError",
>-                function () {
>-                    crossorigin.deleteRule(0);
>-                },
>-                "Cross origin stylesheet.deleteRule should throw SecurityError.");
>-        }, "Origin-clean check in cross-origin CSSOM Stylesheets");
>-
>-        function doOriginCleanCheck(sheet, name) {
>-            assert_equals(sheet.cssRules.length, 1, name + " stylesheet.cssRules should be accessible.");
>-            sheet.insertRule("#test { margin: 10px; }", 1);
>-            assert_equals(sheet.cssRules.length, 2, name + " stylesheet.insertRule should be accessible.");
>-            sheet.deleteRule(0);
>-            assert_equals(sheet.cssRules.length, 1, name + " stylesheet.deleteRule should be accessible.");
>-        }
>-
>-        test(function() {
>-            doOriginCleanCheck(sameorigin, "Same-origin");
>-        }, "Origin-clean check in same-origin CSSOM Stylesheets");
>-
>-        test(function() {
>-            doOriginCleanCheck(sameorigindata, "data:css");
>-        }, "Origin-clean check in data:css CSSOM Stylesheets");
>-
>-    </script>
>-</head>
>-<body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-green.png b/LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-green.png
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>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/README b/LayoutTests/imported/w3c/web-platform-tests/cssom/support/README
>deleted file mode 100644
>index 2e5f2ad0738c58dfdf7b368d1fff7aca4f797156..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/README
>+++ /dev/null
>@@ -1,28 +0,0 @@
>-CSS Global Support Directory
>-============================
>-
>-This directory contains common support files (such as images and external
>-style sheets). These are sync'ed into the support directories of all our
>-test suites. If you have test-suite-specific support files, please add
>-them to the appropriate test-suite-specific support/ directory.
>-
>-If you add to a support/ directory, please run the tools/supportprop.py
>-script from the top of the repository to cascade support files into the
>-lower-level support directories.
>-
>-Description of the Common Support File Collection
>--------------------------------------------------
>-
>-The 1x1-* images are all exactly one pixel.
>-
>-The swatch-* images all use 15x15 cells.
>-
>-The square-* images all use 15x15 cells with one pixel borders.
>-
>-The pattern-* images use cells of various sizes:
>-
>-   pattern-grg-rgr-grg.png   20x20
>-   pattern-rgr-grg-rgr.png   20x20
>-   pattern-tr.png            15x15
>-   pattern-grg-rrg-rgg.png   15x15
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/a-green.css b/LayoutTests/imported/w3c/web-platform-tests/cssom/support/a-green.css
>deleted file mode 100644
>index b0dbb071d5b05d1c574cd5c9a660f1e3d62c573b..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/a-green.css
>+++ /dev/null
>@@ -1 +0,0 @@
>-.a { color: green; }
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/b-green.css b/LayoutTests/imported/w3c/web-platform-tests/cssom/support/b-green.css
>deleted file mode 100644
>index a0473f5ca26652c1229290bbf1f81eabc1e37280..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/b-green.css
>+++ /dev/null
>@@ -1 +0,0 @@
>-.b { color: green; }
>\ No newline at end of file
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/c-red.css b/LayoutTests/imported/w3c/web-platform-tests/cssom/support/c-red.css
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>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/c-red.css
>+++ /dev/null
>@@ -1 +0,0 @@
>-.c { color: red; }
>\ No newline at end of file
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/cat.png b/LayoutTests/imported/w3c/web-platform-tests/cssom/support/cat.png
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>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/support/README b/LayoutTests/imported/w3c/web-platform-tests/cssom/support/support/README
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>-The swatch-green.png file in this directory is really a RED swatch,
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>-
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>\ No newline at end of file
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>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/support/w3c-import.log b/LayoutTests/imported/w3c/web-platform-tests/cssom/support/support/w3c-import.log
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>+++ /dev/null
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>-The tests in this directory were imported from the W3C repository.
>-Do NOT modify these tests directly in WebKit.
>-Instead, create a pull request on the WPT github:
>-	https://github.com/w3c/web-platform-tests
>-
>-Then run the Tools/Scripts/import-w3c-tests in WebKit to reimport
>-
>-Do NOT modify or remove this file.
>-
>-------------------------------------------------------------------------
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>-None
>-Property values requiring vendor prefixes:
>-None
>-------------------------------------------------------------------------
>-List of files:
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/support/README
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/support/swatch-green.png
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>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-tr.png b/LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-tr.png
>deleted file mode 100644
>index 59843ae54b64f6ce4f7e616d4be491c911ea84cf..0000000000000000000000000000000000000000
>GIT binary patch
>literal 0
>HcmV?d00001
>
>literal 1235
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>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/w3c-import.log b/LayoutTests/imported/w3c/web-platform-tests/cssom/support/w3c-import.log
>deleted file mode 100644
>index cc858b2e72bf4ee80bb4fba0338cdfcb0f041019..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/w3c-import.log
>+++ /dev/null
>@@ -1,59 +0,0 @@
>-The tests in this directory were imported from the W3C repository.
>-Do NOT modify these tests directly in WebKit.
>-Instead, create a pull request on the WPT github:
>-	https://github.com/w3c/web-platform-tests
>-
>-Then run the Tools/Scripts/import-w3c-tests in WebKit to reimport
>-
>-Do NOT modify or remove this file.
>-
>-------------------------------------------------------------------------
>-Properties requiring vendor prefixes:
>-None
>-Property values requiring vendor prefixes:
>-None
>-------------------------------------------------------------------------
>-List of files:
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-green.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-lime.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-maroon.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-navy.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-red.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/1x1-white.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/60x60-gg-rr.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/60x60-green.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/60x60-red.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/README
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/a-green.css
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/b-green.css
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/c-red.css
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/cat.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/import-charset.css
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/import-green.css
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/import-red.css
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/pattern-grg-rgr-grg.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/pattern-grg-rrg-rgg.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/pattern-rgr-grg-rgr.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/pattern-tr.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/ruler-h-50%.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/ruler-h-50px.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/ruler-v-100px.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/ruler-v-50px.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/square-purple.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/square-teal.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/square-white.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-blue.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-green.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-lime.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-orange.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-red.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-teal.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-white.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/swatch-yellow.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-bl.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-br.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-inner-half-size.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-outer.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-tl.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/test-tr.png
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/support/xmlss-pi.xhtml
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/xmlss-pi.xhtml b/LayoutTests/imported/w3c/web-platform-tests/cssom/support/xmlss-pi.xhtml
>deleted file mode 100644
>index 8e22b50b25a5458d832e31bb3c61e0ed881fb59c..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/support/xmlss-pi.xhtml
>+++ /dev/null
>@@ -1 +0,0 @@
>-<?xml-stylesheet href='data:text/css,'?><html xmlns='http://www.w3.org/1999/xhtml'/>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-count-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-count-expected.txt
>deleted file mode 100644
>index bcf4b947450d2a714aae9ba4c0b18bc2e3426edf..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-count-expected.txt
>+++ /dev/null
>@@ -1,5 +0,0 @@
>-
>-PASS stylesheet.css should be loaded and styleSheets.length === 1 
>-PASS stylesheet.css should be unloaded and styleSheets.length === 0 
>-FAIL stylesheet-1.css should be loaded and styleSheets.length === 1 assert_equals: styleSheets.length is incorrect: expected 1 but got 0
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-count.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-count.html
>deleted file mode 100644
>index f507a961032df941eac1b3f3872f55d099afd498..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-count.html
>+++ /dev/null
>@@ -1,68 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-<head>
>-    <title>CSSOM - Extensions to the Document Interface: StyleSheetList length reflects dynamically loaded and unloaded sheets</title>
>-    <link rel="author" title="Jesse Bounds" href="mailto:jesse@codeforamerica.org">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#extensions-to-the-document-interface">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-stylesheetlist-interface">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-style-sheet-collections">
>-    <link rel="stylesheet" href="stylesheet.css" type="text/css">
>-    <meta name="flags" content="dom">
>-    <meta name="assert" content="The styleSheets length attribute must reflect the number of sheets at page load and after dynamically">
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-    <script id="metadata_cache">/*
>-      {
>-          "stylesheet.css should be loaded and styleSheets.length === 1": {},
>-            "stylesheet.css should be unloaded and styleSheets.length === 0": {},
>-              "stylesheet-1.css should be loaded and styleSheets.length === 1": {}
>-      }
>-    */</script>
>-</head>
>-<body>
>-    <div id="log"></div>
>-    <script>
>-
>-      // Get the Document's styleSheets attribute
>-      var styleSheets = document.styleSheets;
>-
>-      // Verify that the styleSheets list length is 1 due to "stylesheet.css" loaded in head section
>-      test(function() {
>-        assert_equals(styleSheets.length, 1, "styleSheets.length is incorrect:");
>-      }, "stylesheet.css should be loaded and styleSheets.length === 1");
>-
>-      // Verify that the styleSheets list length is 0 after removing the loaded sheet from the DOM
>-      test(function() {
>-
>-        // get the one and only sheet loaded
>-        var sheet = styleSheets.item(0);
>-
>-        // remove the sheet from the DOM
>-        sheet.ownerNode.parentNode.removeChild(sheet.ownerNode)
>-
>-        // assert that there are 0 styleSheets in the styleSheets property
>-        assert_equals(styleSheets.length, 0, "styleSheets.length is incorrect:");
>-
>-      }, "stylesheet.css should be unloaded and styleSheets.length === 0");
>-
>-      // Verify that the styleSheets list length is back to 1 after loading a new sheet
>-      test(function() {
>-
>-        // create a css file reference
>-        var fileReference = document.createElement("link");
>-        fileReference.setAttribute("rel", "stylesheet");
>-        fileReference.setAttribute("type", "text/css");
>-        fileReference.setAttribute("href", "stylesheet-1.css");
>-
>-        // load the css file reference into the head section
>-        var head = document.getElementsByTagName("HEAD")[0];
>-        head.appendChild(fileReference);
>-
>-        // assert that there is 1 styleSheet in the styleSheets property
>-        assert_equals(styleSheets.length, 1, "styleSheets.length is incorrect:");
>-
>-      }, "stylesheet-1.css should be loaded and styleSheets.length === 1");
>-
>-    </script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-tree-order-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-tree-order-expected.txt
>deleted file mode 100644
>index 80391760c1bc8907fb2dc99905193eccc4806d2c..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-tree-order-expected.txt
>+++ /dev/null
>@@ -1,8 +0,0 @@
>-
>-FAIL styleSheets.length must be 5 assert_equals: styleSheets.length is incorrect: expected 5 but got 1
>-PASS styleSheets item 0 title must be aaa 
>-FAIL styleSheets item 1 title must be zebra null is not an object (evaluating 'styleSheets.item(1).title')
>-FAIL styleSheets item 0 title must be kilo null is not an object (evaluating 'styleSheets.item(2).title')
>-FAIL styleSheets item 0 title must be alpha null is not an object (evaluating 'styleSheets.item(3).title')
>-FAIL styleSheets item 0 title must be zebra null is not an object (evaluating 'styleSheets.item(4).title')
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-tree-order.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-tree-order.html
>deleted file mode 100644
>index 795ead02f4b2598d037c6d059f303f020c3d5d20..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-tree-order.html
>+++ /dev/null
>@@ -1,56 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-<head>
>-    <title>CSSOM -  Extensions to the Document Interface: Stylesheet header load order</title>
>-    <link rel="author" title="Jesse Bounds" href="mailto:jesse@codeforamerica.org">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#extensions-to-the-document-interface">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-stylesheetlist-interface">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-style-sheet-collections">
>-    <style title="aaa" type="text/css">
>-      H1 {border-width: 1; border: solid; text-align: center}
>-    </style>
>-    <link title="zebra" rel="stylesheet" href="zebra.css" type="text/css">
>-    <link title="kilo" rel="stylesheet" href="kilo.css"  type="text/css">
>-    <link title="alpha" rel="stylesheet" href="alpha.css" type="text/css">
>-    <link title="zebra" rel="stylesheet" href="/directory01/zebra.css" type="text/css">
>-    <meta name="flags" content="dom">
>-    <meta name="assert" content="Document's style sheets created from HTTP Link headers are first in list and loaded in header order">
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-</head>
>-<body>
>-    <div id="log"></div>
>-    <script>
>-
>-      // Get the Document's styleSheets attribute
>-      var styleSheets = document.styleSheets;
>-
>-      // Verify that the styleSheets list length is 5
>-      test(function() {
>-        assert_equals(styleSheets.length, 5, "styleSheets.length is incorrect:");
>-      }, "styleSheets.length must be 5");
>-
>-      // Verify that titles of loaded sheets are as expected (in the correct order)
>-      test(function() {
>-        assert_equals(styleSheets.item(0).title, "aaa", "title for item 1 is incorrect:");
>-      }, "styleSheets item 0 title must be aaa");
>-      // Verify that titles of loaded sheets are as expected (in the correct order)
>-      test(function() {
>-        assert_equals(styleSheets.item(1).title, "zebra", "title for item 1 is incorrect:");
>-      }, "styleSheets item 1 title must be zebra");
>-      // Verify that titles of loaded sheets are as expected (in the correct order)
>-      test(function() {
>-        assert_equals(styleSheets.item(2).title, "kilo", "title for item 1 is incorrect:");
>-      }, "styleSheets item 0 title must be kilo");
>-      // Verify that titles of loaded sheets are as expected (in the correct order)
>-      test(function() {
>-        assert_equals(styleSheets.item(3).title, "alpha", "title for item 1 is incorrect:");
>-      }, "styleSheets item 0 title must be alpha");
>-      // Verify that titles of loaded sheets are as expected (in the correct order)
>-      test(function() {
>-        assert_equals(styleSheets.item(4).title, "zebra", "title for item 1 is incorrect:");
>-      }, "styleSheets item 0 title must be zebra");
>-
>-    </script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-document-extension-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-document-extension-expected.txt
>deleted file mode 100644
>index ee4857c4bfd7c2996783e789c1cb3bdda5812820..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-document-extension-expected.txt
>+++ /dev/null
>@@ -1,3 +0,0 @@
>-
>-PASS CSSOM - Extensions to the Document Interface: StyleSheetList length is 0 when no sheets loaded 
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-document-extension.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-document-extension.html
>deleted file mode 100644
>index 5d968b90283cce1c77e894a6231814554501c102..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-document-extension.html
>+++ /dev/null
>@@ -1,25 +0,0 @@
>-<!DOCTYPE html>
>-<html>
>-<head>
>-    <title>CSSOM - Extensions to the Document Interface: StyleSheetList length is 0 when no sheets loaded</title>
>-    <link rel="author" title="Jesse Bounds" href="mailto:jesse@codeforamerica.org">
>-    <link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> 
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#extensions-to-the-document-interface">
>-    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-stylesheetlist-interface">
>-    <meta name="flags" content="dom">
>-    <meta name="assert" content="The styleSheets attribute must return a StyleSheetList sequence representing the document style sheets.">
>-    <script src="/resources/testharness.js"></script>
>-    <script src="/resources/testharnessreport.js"></script>
>-</head>
>-<body>
>-    <div id="log"></div>
>-    <script>
>-        // Get the Document's styleSheets attribute
>-        var styleSheets = document.styleSheets;
>-        // Verify that the styleSheets list length is 0 because no stylesheets have been loaded
>-        test(function() {
>-          assert_equals(styleSheets.length, 0, "styleSheets.length is incorrect:");
>-        })
>-    </script>
>-</body>
>-</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/variable-names-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/cssom/variable-names-expected.txt
>deleted file mode 100644
>index 5bfc003c47fe7f1ab2fe89484b007480e34211d7..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/variable-names-expected.txt
>+++ /dev/null
>@@ -1,8 +0,0 @@
>-
>-FAIL custom property '--a' assert_equals: property value returned correctly from specified style getPropertyValue (after serialization/re-parsing) expected "value" but got " value"
>-FAIL custom property '--a;b' assert_equals: appears on specified style (after serialization/re-parsing) expected 1 but got 0
>-FAIL custom property '---' assert_equals: property value returned correctly from specified style getPropertyValue (after serialization/re-parsing) expected "value" but got " value"
>-FAIL custom property '--\' assert_equals: appears on specified style (after serialization/re-parsing) expected 1 but got 0
>-FAIL custom property '--ab' assert_equals: property value returned correctly from specified style getPropertyValue (after serialization/re-parsing) expected "value" but got " value"
>-FAIL custom property '--0' assert_equals: property value returned correctly from specified style getPropertyValue (after serialization/re-parsing) expected "value" but got " value"
>-
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/variable-names.html b/LayoutTests/imported/w3c/web-platform-tests/cssom/variable-names.html
>deleted file mode 100644
>index b951b7dfbb2f7fd25dee2346f996e57d6b6afd68..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/variable-names.html
>+++ /dev/null
>@@ -1,47 +0,0 @@
>-<!DOCTYPE html>
>-<meta charset="utf-8">
>-<title>Tests for handling of CSS Custom Property names</title>
>-<meta name="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
>-<script src="/resources/testharness.js"></script>
>-<script src="/resources/testharnessreport.js"></script>
>-<div id="log"></div>
>-<script>
>-
>-// Valid custom property names, before and after CSS escaping.
>-var valid_names = [
>-  ["--a", "--a"],
>-  ["--a;b", "--a\\;b"],
>-  ["---", "---"],
>-  ["--\\", "--\\\\"],
>-  ["--ab", "--\\61 b"],
>-  ["--0", "--\\30 "],
>-];
>-
>-valid_names.forEach(function(t) {
>-  var name = t[0];
>-  var escaped_name = t[1];
>-
>-  test(function() {
>-    var e = document.createElement("span");
>-    e.style = escaped_name + ":value";
>-
>-    for (var after_refeeding = 0; after_refeeding <= 1; ++after_refeeding) {
>-      var desc_suffix = (after_refeeding ? " (after " : " (before ") +
>-                        "serialization/re-parsing)";
>-
>-      assert_equals(e.style.length, 1,
>-                    "appears on specified style" + desc_suffix);
>-
>-      assert_equals(e.style[0], name,
>-                    "name returned correctly from specified " +
>-                    "style indexed getter" + desc_suffix);
>-
>-      assert_equals(e.style.getPropertyValue(name), "value",
>-                    "property value returned correctly from " +
>-                    "specified style getPropertyValue" + desc_suffix);
>-
>-      e.style = e.style.cssText;
>-    }
>-  }, "custom property '" + name + "'");
>-});
>-</script>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/cssom/w3c-import.log b/LayoutTests/imported/w3c/web-platform-tests/cssom/w3c-import.log
>deleted file mode 100644
>index bca4649452b8df9eccc1b71b08427fe5d1d4d00d..0000000000000000000000000000000000000000
>--- a/LayoutTests/imported/w3c/web-platform-tests/cssom/w3c-import.log
>+++ /dev/null
>@@ -1,72 +0,0 @@
>-The tests in this directory were imported from the W3C repository.
>-Do NOT modify these tests directly in WebKit.
>-Instead, create a pull request on the WPT github:
>-	https://github.com/w3c/web-platform-tests
>-
>-Then run the Tools/Scripts/import-w3c-tests in WebKit to reimport
>-
>-Do NOT modify or remove this file.
>-
>-------------------------------------------------------------------------
>-Properties requiring vendor prefixes:
>-None
>-Property values requiring vendor prefixes:
>-None
>-------------------------------------------------------------------------
>-List of files:
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/CSS.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframeRule.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSKeyframesRule.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSNamespaceRule.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSRuleList.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleRule.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/CSSStyleSheet.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/GetBoundingRect.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/MediaList2.xhtml
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/OWNERS
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/StyleSheetList.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/computed-style-001.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-attribute-modifications.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/css-style-declaration-modifications.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/cssimportrule.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssText-serialize.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-cssstyledeclaration-set.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule-constructors.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-fontfacerule.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-ruleTypeAndOrder.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/cssom-setProperty-shorthand.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-csstext.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/cssstyledeclaration-mutability.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/escape.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/getComputedStyle-pseudo.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/historical.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/index-001.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/index-002.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/inline-style-001.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-charset-no-index.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-import-no-index.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-namespace-no-index.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/insertRule-no-index.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/interfaces.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-001.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-002.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-003.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/medialist-interfaces-004.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/overflow-serialization.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorSerialize.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorText-modification-restyle-001-expected.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/selectorText-modification-restyle-001.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/serialization-CSSDeclaration-with-important.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-namespaced-type-selectors.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-values.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/serialize-variable-reference.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/shorthand-serialization.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-001.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/style-sheet-interfaces-002.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.css
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/stylesheet-same-origin.sub.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-count.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-doc-ext-load-tree-order.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/ttwf-cssom-document-extension.html
>-/LayoutTests/imported/w3c/web-platform-tests/cssom/variable-names.html

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Attachments on bug 179391: 340796 | 340797 | 340801 | 340844 | 340852 | 340853 | 340854 | 340856 | 340859 | 340866 | 340961 | 340965 | 340967 | 340971 | 340972