Bug 299844

Summary: [css-anchor-position-1] fragmented anchors inside vertical-rl multicol are miscalculated
Product: WebKit Reporter: fantasai <fantasai.bugs>
Component: Layout and RenderingAssignee: fantasai <fantasai.bugs>
Status: RESOLVED FIXED    
Severity: Normal CC: bfulgham, kiet.ho, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: WebKit Local Build   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on:    
Bug Blocks: 289743, 291856    

fantasai
Reported 2025-09-29 19:28:01 PDT
We correctly calculate the bounding box of fragmented anchors inside multi-column containers in general, but for writing-mode: vertical-rl, we aren't converting the coordinates correctly. This causes failures in the anchor-position-multicol-007 and anchor-position-multicol-008 WPT tests.
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Radar WebKit Bug Importer
Comment 1 2025-09-29 19:28:08 PDT
<rdar://problem/161616545>
fantasai
Comment 2 2025-09-29 21:05:28 PDT
Pull request: https://github.com/WebKit/WebKit/pull/51546
EWS
Comment 3 2025-10-01 00:37:15 PDT
Committed 300807@main (163e126799f6): <https://commits.webkit.org/300807@main> Reviewed commits have been landed. Closing PR #51546 and removing active labels.
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