Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: d19f4a9df5a6ce6802a25ae028ef2cc86d673ede
https://github.com/WebKit/WebKit/commit/d19f4a9df5a6ce6802a25ae028ef2cc86d673ede
Author: Alexsander Borges Damaceno <abor...@igalia.com>
Date: 2025-08-15 (Fri, 15 Aug 2025)
Changed paths:
A
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/no-anchor-anchor-center-expected.html
A
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/no-anchor-anchor-center-ref.html
A
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/no-anchor-anchor-center.html
M Source/WebCore/rendering/PositionedLayoutConstraints.cpp
Log Message:
-----------
[css-anchor-position-1] Wrong anchor-center behavior when target is absolute
child of fixed element
https://bugs.webkit.org/show_bug.cgi?id=295504
Reviewed by Alan Baradlay.
When anchor-center is used on an anchored element,
the anchor must be in the same containing block as the anchored element in
order to center element using anchor center position.
If no anchor exists in the containing block, the behavior should fallback to
justify: center,
as listed in the specifications.
https://drafts.csswg.org/css-anchor-position-1/#target:
"Both elements are in the same top layer and have the same containing block,
and are both absolutely positioned,
and possible anchor is earlier in flat tree order than positioned el."
"Both elements are in the same top layer and have the same containing block,
but possible anchor isn’t absolutely positioned."
https://drafts.csswg.org/css-anchor-position-1/#anchor-center:
"If the box is not absolutely positioned,
or does not have a default anchor box,
this value behaves as center and has no additional effect on how inset
properties resolve."
*
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/no-anchor-anchor-center-ref.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/no-anchor-anchor-center.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/no-anchor-anchor-center-expected.html:
Added.
* Source/WebCore/rendering/PositionedLayoutConstraints.cpp:
(WebCore::PositionedLayoutConstraints::resolvePosition const):
Canonical link: https://commits.webkit.org/298766@main
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