Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: cda2ef22872dd8f0a077224eb1abc43f3e24f18d
https://github.com/WebKit/WebKit/commit/cda2ef22872dd8f0a077224eb1abc43f3e24f18d
Author: Kiet Ho <kiet...@apple.com>
Date: 2025-07-16 (Wed, 16 Jul 2025)
Changed paths:
A
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-scroll-fixedpos-004-expected.html
A
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-scroll-fixedpos-004.html
A
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/reference/anchor-scroll-fixedpos-004-ref.html
M Source/WebCore/rendering/RenderLayer.cpp
Log Message:
-----------
[css-anchor-position-1] Scroll compensation transform should be applied
before any other transforms
rdar://155637149
https://bugs.webkit.org/show_bug.cgi?id=295801
Reviewed by Simon Fraser.
For scroll compensation, WebKit applies the shift transform after other
transforms,
but the spec says otherwise [1]:
> After layout has been performed for abspos, it is additionally shifted by the
> default scroll shift, as if affected by a transform (before any other
> transforms).
Transforms are not commutative, so e.g rotate(45deg) translate(...) is
different from
translate(...) rotate(45deg). Fix this to follow the spec and match Chrome's
behavior.
[1] https://drafts.csswg.org/css-anchor-position-1/#default-scroll-shift
*
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-scroll-fixedpos-004-expected.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-scroll-fixedpos-004.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/reference/anchor-scroll-fixedpos-004-ref.html:
Added.
* Source/WebCore/rendering/RenderLayer.cpp:
(WebCore::RenderLayer::updateTransformFromStyle const):
- Apply scroll compensation transform before other transforms.
Canonical link: https://commits.webkit.org/297483@main
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