Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: d2f5260584c57562d71dd883203e5d3c36f2eea1
https://github.com/WebKit/WebKit/commit/d2f5260584c57562d71dd883203e5d3c36f2eea1
Author: Elika Etemad <[email protected]>
Date: 2026-09-20 (Sun, 20 Sep 2026)
Changed paths:
A
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-fixedpos-nested-scroll-001-expected.html
A
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-fixedpos-nested-scroll-001-ref.html
A
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-fixedpos-nested-scroll-001.html
M Source/WebCore/style/AnchorPositionEvaluator.cpp
Log Message:
-----------
REGRESSION(Safari 27): anchored box inside modal dialog missing if page is
scrolled
https://bugs.webkit.org/show_bug.cgi?id=324348
rdar://187582516
Reviewed by Kiet Ho.
311715@main rewrote the body of offsetFromAncestorContainer() to use
localToContainerQuad(); however in the process it lost the ancestor checks
for isFixed. This is causing the anchor position to be incorrectly calculated
when layout happens after scrolling away from the origin--for example
if a fixed box contains a non-positioned anchor for an anchor-positioned
fixed child--resulting in the anchored box being laid out offscreen, and
thus entirely invisible.
This updates our isFixed() helper to handle boxes that don't themselves
have a RenderLayer, which fixes this problem... and prossibly some other
scenarios as well.
Tests:
imported/w3c/web-platform-tests/css/css-anchor-position/anchor-fixedpos-nested-scroll-001.html
*
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-fixedpos-nested-scroll-001-expected.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-fixedpos-nested-scroll-001-ref.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-fixedpos-nested-scroll-001.html:
Added.
* Source/WebCore/style/AnchorPositionEvaluator.cpp:
(WebCore::Style::isFixed):
(WebCore::Style::AnchorPositionEvaluator::captureScrollSnapshots):
Canonical link: https://commits.webkit.org/321475@main
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