RESOLVED FIXED301616
Overconstrained sticky positioned element shifts on scroll 
https://bugs.webkit.org/show_bug.cgi?id=301616
Summary Overconstrained sticky positioned element shifts on scroll
Johannes Odland
Reported 2025-10-29 01:30:50 PDT
Created attachment 477220 [details] Screen recording of the issue When a sticky element is larger than the sticky view rectangle, the _end_ edge of the sticky view rectangle should be adjusted to accommodate the sticky element. As a result, the top edge should align as specified. In iOS Safari however, the sticky element is sometimes shifted around when scrolling, so that the top edge no longer aligns. Minimal reproduction: https://johannesodland.github.io/browserbugs/2025/safari-shifting-of-overconstrained-sticky.html When scrolling in the above example, the last sticky element with a purple outline is sometimes shifted around, revealing another sticky element with a red outline.
Attachments
Screen recording of the issue (15.48 MB, video/quicktime)
2025-10-29 01:30 PDT, Johannes Odland 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2025-10-29 10:40:12 PDT
<rdar://problem/163654023>
Johannes Odland
Comment 2 2025-11-23 01:34:28 PST
Pull request: https://github.com/WebKit/WebKit/pull/54384
EWS
Comment 3 2025-12-11 20:21:01 PST
Committed 304335@main (89d5b99990f0): <https://commits.webkit.org/304335@main> Reviewed commits have been landed. Closing PR #54384 and removing active labels.
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