223141 2021-03-12 14:15:47 -0800 Runtime-disabled CSS features still still appear enabled via two-arg CSS.supports() 2025-09-30 17:57:21 -0700 1 1 1 Unclassified WebKit CSS WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=222280 https://bugs.webkit.org/show_bug.cgi?id=299921 InRadar P2 Normal --- 1 gsnedders simon.fraser darin esprehn+autocc ews-watchlist glenn gyuyoung.kim karlcow koivisto macpherson menard simon.fraser webkit-bug-importer oldest_to_newest 1739027 0 gsnedders 2021-03-12 14:15:47 -0800 bug 222280 fixed: > CSS.supports("overscroll-behavior: inherit") < true however, even after that: > CSS.supports("overscroll-behavior: inherit") < false > CSS.supports("overscroll-behavior", "inherit") < true 1739028 1 webkit-bug-importer 2021-03-12 14:16:09 -0800 <rdar://problem/75377891> 1740029 2 simon.fraser 2021-03-16 10:49:40 -0700 There's a different entry point for the comma separated list version: DOMCSSNamespace::supports(Document& document, const String& property, const String& value) 1740059 3 423362 simon.fraser 2021-03-16 11:14:23 -0700 Created attachment 423362 Patch 1740065 4 423362 koivisto 2021-03-16 11:28:48 -0700 Comment on attachment 423362 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=423362&action=review > Source/WebCore/css/DOMCSSNamespace.cpp:67 > > + CSSParserContext parserContext(document); > + if (parserContext.isPropertyRuntimeDisabled(propertyID)) > + propertyID = CSSPropertyInvalid; > + > if (propertyID == CSSPropertyInvalid) > return false; You can just return false in the first branch 1740216 5 simon.fraser 2021-03-16 14:40:56 -0700 https://trac.webkit.org/changeset/274520/webkit 1740229 6 423362 darin 2021-03-16 14:58:09 -0700 Comment on attachment 423362 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=423362&action=review Tiny clean-up suggestions on moved code. > Source/WebCore/css/parser/CSSParserContext.cpp:161 > +#if ENABLE(TEXT_AUTOSIZING) > + case CSSPropertyWebkitTextSizeAdjust: > +#if !PLATFORM(IOS_FAMILY) > + return !textAutosizingEnabled; > +#endif > + return false; > +#endif // ENABLE(TEXT_AUTOSIZING) This can be written in a less strange way: #if ENABLE(TEXT_AUTOSIZING) && !PLATFORM(IOS_FAMILY) case CSSPropertyWebkitTextSizeAdjust: return !textAutosizingEnabled; #endif No need for the nested #if and double return statements. > Source/WebCore/css/parser/CSSParserContext.cpp:169 > + return false; This unreachable code should be removed. 1740230 7 423362 darin 2021-03-16 14:58:10 -0700 Comment on attachment 423362 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=423362&action=review Tiny clean-up suggestions on moved code. > Source/WebCore/css/parser/CSSParserContext.cpp:161 > +#if ENABLE(TEXT_AUTOSIZING) > + case CSSPropertyWebkitTextSizeAdjust: > +#if !PLATFORM(IOS_FAMILY) > + return !textAutosizingEnabled; > +#endif > + return false; > +#endif // ENABLE(TEXT_AUTOSIZING) This can be written in a less strange way: #if ENABLE(TEXT_AUTOSIZING) && !PLATFORM(IOS_FAMILY) case CSSPropertyWebkitTextSizeAdjust: return !textAutosizingEnabled; #endif No need for the nested #if and double return statements. > Source/WebCore/css/parser/CSSParserContext.cpp:169 > + return false; This unreachable code should be removed. 1742337 8 simon.fraser 2021-03-22 11:57:02 -0700 Followups in https://trac.webkit.org/changeset/274725/webkit and https://trac.webkit.org/changeset/274756/webkit 2123160 9 karlcow 2025-06-11 18:21:44 -0700 Relevant WPT test https://wpt.fyi/results/css/css-conditional/js/CSS-supports-CSSStyleDeclaration.html 2123329 10 simon.fraser 2025-06-12 12:47:56 -0700 Is this bug only about `-epub` prefixed properties now? 2123419 11 karlcow 2025-06-12 18:46:49 -0700 This bug is marked as fixed. They are still a couple of failures, but I can open a separate bug. There are 19 Fail including 9 about the prefix -epub-* which is converted as Epub by the test script. Fail -epub-caption-side: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-text-combine: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-text-emphasis: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-text-emphasis-color: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-text-emphasis-style: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-text-orientation: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-text-transform: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-word-break: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-writing-mode: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail font-display: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail font-display: _dashed_attribute v. CSS.supports assert_equals: expected true but got false Fail inherits: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail initial-value: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail initial-value: _dashed_attribute v. CSS.supports assert_equals: expected true but got false Fail size: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail src: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail syntax: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail unicode-range: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail unicode-range: _dashed_attribute v. CSS.supports assert_equals: expected true but got false 423362 2021-03-16 11:14:23 -0700 2021-03-16 11:28:48 -0700 Patch bug-223141-20210316111422.patch text/plain 10340 simon.fraser U3VidmVyc2lvbiBSZXZpc2lvbjogMjc0NDYxCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggYWRiYmEwMTg4ZTZlN2Yy N2ZmYjcxYTM1ZjA5NjFhZTEwNzA2ODQ5OS4uNDZjYzdkMmNmMTgxNWYzYzgwM2YzYzhkNjkxMDEw YWY1ODhmN2FhZSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI4IEBACisyMDIxLTAzLTE2ICBTaW1v biBGcmFzZXIgIDxzaW1vbi5mcmFzZXJAYXBwbGUuY29tPgorCisgICAgICAgIFJ1bnRpbWUtZGlz YWJsZWQgQ1NTIGZlYXR1cmVzIHN0aWxsIHN0aWxsIGFwcGVhciBlbmFibGVkIHZpYSB0d28tYXJn IENTUy5zdXBwb3J0cygpCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVn LmNnaT9pZD0yMjMxNDEKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKwor ICAgICAgICBGaXggdGhlICJwcm9wZXJ0eSIsICJ2YWx1ZSIgQ1NTLnN1cHBvcnRzKCkgZW50cnlw 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