Create a containing block when relevant properties are set in the current element will-change

• Component: CSS
• Status: RESOLVED FIXED

[Simon Fraser (smfr)]

will-change: position should create containing block for positioned descendants

[Simon Fraser (smfr)]

Created attachment 300687 [details]
Patch

[Build Bot]

Comment on attachment 300687 [details]
Patch

Attachment 300687 [details] did not pass mac-debug-ews (mac):
Output: http://webkit-queues.webkit.org/results/3011973

New failing tests:
fast/css/will-change/will-change-creates-stacking-context-inline.html

[Build Bot]

Created attachment 300689 [details]
Archive of layout-test-results from ews115 for mac-elcapitan

The attached test failures were seen while running run-webkit-tests on the mac-debug-ews.
Bot: ews115  Port: mac-elcapitan  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 300687 [details]
Patch

Attachment 300687 [details] did not pass mac-ews (mac):
Output: http://webkit-queues.webkit.org/results/3012020

New failing tests:
fast/css/will-change/will-change-creates-stacking-context-inline.html

[Build Bot]

Created attachment 300690 [details]
Archive of layout-test-results from ews101 for mac-elcapitan

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: ews101  Port: mac-elcapitan  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 300687 [details]
Patch

Attachment 300687 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.webkit.org/results/3012028

New failing tests:
fast/css/will-change/will-change-creates-stacking-context-inline.html

[Build Bot]

Created attachment 300691 [details]
Archive of layout-test-results from ews106 for mac-elcapitan-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews106  Port: mac-elcapitan-wk2  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 300687 [details]
Patch

Attachment 300687 [details] did not pass ios-sim-ews (ios-simulator-wk2):
Output: http://webkit-queues.webkit.org/results/3012033

New failing tests:
fast/css/will-change/will-change-creates-stacking-context-inline.html

[Build Bot]

Created attachment 300692 [details]
Archive of layout-test-results from ews123 for ios-simulator-wk2

The attached test failures were seen while running run-webkit-tests on the ios-sim-ews.
Bot: ews123  Port: ios-simulator-wk2  Platform: Mac OS X 10.11.6

[Maciej Stachowiak]

Comment on attachment 300687 [details]
Patch

No idea if this patch is still relevant or still applies, but looks good to me. Maybe it should be re-run through modern EWS?

r=me assuming it still applies and passes tests.

[Tim Nguyen (:ntim)]

Created attachment 426708 [details]
Patch

[Radar WebKit Bug Importer]

<rdar://problem/76966899>

[Tim Nguyen (:ntim)]

Created attachment 426734 [details]
Patch

[Tim Nguyen (:ntim)]

I've made this more generic so I could fix multiple issues in one go.

[Tim Nguyen (:ntim)]

Created attachment 426807 [details]
Patch

[Tim Nguyen (:ntim)]

Created attachment 427007 [details]
Patch

[Tim Nguyen (:ntim)]

Created attachment 427008 [details]
Patch

[Darin Adler]

Comment on attachment 427008 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=427008&action=review

> Source/WebCore/rendering/style/WillChangeData.cpp:75
> +        || containsProperty(CSSPropertyWebkitBackdropFilter);

Needs #if #if ENABLE(FILTERS_LEVEL_2).

[Tim Nguyen (:ntim)]

Created attachment 427011 [details]
Patch

[zalan]

Comment on attachment 427011 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=427011&action=review

> Source/WebCore/rendering/RenderElement.h:432
> +        || (isRenderBlock() && hasTransform())
> +        // FIXME: will-change should create containing blocks on inline boxes (bug 225035)
> +        || (!isRenderInline() && style().willChange() && style().willChange()->canCreateContainingBlockForAbsOrFixedPos())

Since this is a workaround for RenderObject::containingBlock()'s return value, I'd specifically test for RenderBlock and not for !RenderInline (in practice they probably produce the same result, but checking against RenderBlock is less error prone).

> Source/WebCore/rendering/style/WillChangeData.cpp:63
> +bool WillChangeData::canCreateContainingBlockForAbsOrFixedPos() const

please do not shorten names like "Abs" or "Pos" (I am not good at naming but maybe this should read willCreate....)

[Simon Fraser (smfr)]

Comment on attachment 427011 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=427011&action=review

> Source/WebCore/rendering/style/WillChangeData.h:55
> +    bool canCreateContainingBlockForAbsOrFixedPos() const;

We call these "out of flow positioned:.

[Tim Nguyen (:ntim)]

Created attachment 427067 [details]
Patch

[EWS]

Committed r276627 (237055@main): <https://commits.webkit.org/237055@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 427067 [details].