Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 37e919fcc61695e0f5ddd948ca1b6929b47e57f7
https://github.com/WebKit/WebKit/commit/37e919fcc61695e0f5ddd948ca1b6929b47e57f7
Author: islandryu <[email protected]>
Date: 2026-02-27 (Fri, 27 Feb 2026)
Changed paths:
M LayoutTests/TestExpectations
M Source/WebCore/rendering/RenderCounter.cpp
Log Message:
-----------
Do not apply style containment to elements without a principal box
https://bugs.webkit.org/show_bug.cgi?id=308295
Reviewed by Alan Baradlay.
Style containment should have no effect on elements that do not generate
a principal box, per the CSS Containment specification.
WebKit currently applies `contain: style` to such elements.
This change makes the behavior spec-compliant.
Spec:
https://drafts.csswg.org/css-contain/#containment-style
WPT:
https://wpt.live/css/css-contain/contain-style-counters-002.html
This behavior should be covered by
LayoutTests/imported/w3c/web-platform-tests/css/css-contain/contain-style-counters-002.html
* LayoutTests/TestExpectations:
* Source/WebCore/rendering/RenderCounter.cpp:
(WebCore::ancestorStyleContainmentObject):
Canonical link: https://commits.webkit.org/308341@main
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