Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 048234caf02d206285ea0e6f3aebeb9544128276
https://github.com/WebKit/WebKit/commit/048234caf02d206285ea0e6f3aebeb9544128276
Author: Simon Fraser <[email protected]>
Date: 2026-04-04 (Sat, 04 Apr 2026)
Changed paths:
A
LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/suppress-for-top-change-expected.txt
A
LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/suppress-for-top-change.html
M Source/WebCore/rendering/RenderElement.cpp
Log Message:
-----------
[Scroll anchoring] learn.umgc.edu: scrolls to the bottom/top automatically
https://bugs.webkit.org/show_bug.cgi?id=311456
rdar://173885027
Reviewed by Abrar Rahman Protyasha.
This page scrolls uncontrollably because there's a sidebar item whose `top`
is set from script based on scroll position. This should not act as an anchor,
because changing `top` should suppress anchoring.
However, the code was only suppressing anchoring when the `Style::Difference`
was `> Layout`, but this is a `LayoutOutOfFlowMovementOnly` because the anchor
is positioned, so test against the diff types that can result from changes in
the suppression properties[1].
[1] https://drafts.csswg.org/css-scroll-anchoring/#suppression-triggers
Test:
imported/w3c/web-platform-tests/css/css-scroll-anchoring/suppress-for-top-change.html
*
LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/suppress-for-top-change-expected.txt:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/suppress-for-top-change.html:
Added.
* Source/WebCore/rendering/RenderElement.cpp:
(WebCore::RenderElement::styleDidChange):
Canonical link: https://commits.webkit.org/310574@main
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