Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 8b2e2e9fea0e4ddd61af4ddf01251c1cf93c6047
https://github.com/WebKit/WebKit/commit/8b2e2e9fea0e4ddd61af4ddf01251c1cf93c6047
Author: Simon Fraser <[email protected]>
Date: 2026-02-14 (Sat, 14 Feb 2026)
Changed paths:
A
LayoutTests/fast/scrolling/scroll-anchoring-in-overflow-with-page-scale-expected.txt
A
LayoutTests/fast/scrolling/scroll-anchoring-in-overflow-with-page-scale.html
A LayoutTests/fast/scrolling/scroll-anchoring-with-page-scale-expected.txt
A LayoutTests/fast/scrolling/scroll-anchoring-with-page-scale.html
M LayoutTests/fast/visual-viewport/zoomed-fixed-header-and-footer.html
M LayoutTests/fast/visual-viewport/zoomed-fixed.html
M LayoutTests/platform/ios/TestExpectations
M Source/WebCore/page/scrolling/ScrollAnchoringController.cpp
Log Message:
-----------
[Scroll anchoring] Fix scroll anchoring in scaled pages
https://bugs.webkit.org/show_bug.cgi?id=307862
rdar://170352074
Reviewed by Wenson Hsieh.
We have to account for page scale when computing scroll anchoring adjustments.
We do so
as follow:
- use the visual viewport, so that anchor computation finds the anchor at the
top of
this viewport.
- compute absolute coords relative to the RenderView, which excludes page scale
- scale the computed offset by `frameScale` (which is page scale on the root
frame, otherwise 1), but only for document scrolling, not overflow scrolling.
iOS is a little janky: webkit.org/b307861
Tests: fast/scrolling/scroll-anchoring-in-overflow-with-page-scale.html
fast/scrolling/scroll-anchoring-with-page-scale.html
*
LayoutTests/fast/scrolling/scroll-anchoring-in-overflow-with-page-scale-expected.txt:
Added.
* LayoutTests/fast/scrolling/scroll-anchoring-in-overflow-with-page-scale.html:
Added.
* LayoutTests/fast/scrolling/scroll-anchoring-with-page-scale-expected.txt:
Added.
* LayoutTests/fast/scrolling/scroll-anchoring-with-page-scale.html: Added.
* LayoutTests/fast/visual-viewport/zoomed-fixed-header-and-footer.html:
* LayoutTests/fast/visual-viewport/zoomed-fixed.html:
* LayoutTests/platform/ios/TestExpectations:
* Source/WebCore/page/scrolling/ScrollAnchoringController.cpp:
(WebCore::ScrollAnchoringController::computeScrollerRelativeRects const):
(WebCore::ScrollAnchoringController::adjustScrollPositionForAnchoring):
Canonical link: https://commits.webkit.org/307577@main
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