Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: a6a5ef3d9b99675a3cc547c7727d31a9b794e3e4
https://github.com/WebKit/WebKit/commit/a6a5ef3d9b99675a3cc547c7727d31a9b794e3e4
Author: Antti Koivisto <[email protected]>
Date: 2025-09-25 (Thu, 25 Sep 2025)
Changed paths:
A
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchored-transition-display-none-expected.html
A
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchored-transition-display-none-ref.html
A
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchored-transition-display-none.html
M Source/WebCore/style/AnchorPositionEvaluator.cpp
M Source/WebCore/style/AnchorPositionEvaluator.h
Log Message:
-----------
CSS Anchor Positioning prevents display transition when used with
transition-behavior: allow-discrete
https://bugs.webkit.org/show_bug.cgi?id=298680
rdar://160421419
Reviewed by Tim Nguyen.
Transition to 'display:none' combined with an anchor positioning property (like
`position-area`) creates
a situation where the transition repeatedly restarts as we try and fail to
resolve anchor positioning.
Tests:
imported/w3c/web-platform-tests/css/css-anchor-position/anchored-transition-display-none-ref.html
imported/w3c/web-platform-tests/css/css-anchor-position/anchored-transition-display-none.html
*
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchored-transition-display-none-expected.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchored-transition-display-none-ref.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchored-transition-display-none.html:
Added.
* Source/WebCore/style/AnchorPositionEvaluator.cpp:
(WebCore::Style::AnchorPositionEvaluator::updateAnchorPositionedStateForDefaultAnchorAndPositionVisibility):
(WebCore::Style::AnchorPositionEvaluator::isAnchorPositioned):
(WebCore::Style::AnchorPositionEvaluator::isStyleTimeAnchorPositioned):
(WebCore::Style::AnchorPositionEvaluator::isLayoutTimeAnchorPositioned):
Styles that don't generate boxes ('display:none' and 'display:contents') are
not anchor positioned.
* Source/WebCore/style/AnchorPositionEvaluator.h:
Canonical link: https://commits.webkit.org/300519@main
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