Bug 294129

Summary: [css-anchor-position-1] anchor-name mutation doesn't propagate to its anchor-positioned dependency
Product: WebKit Reporter: Kiet Ho <kiet.ho>
Component: CSSAssignee: Antti Koivisto <koivisto>
Status: RESOLVED FIXED    
Severity: Normal CC: kiet.ho, koivisto, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://github.com/web-platform-tests/wpt/pull/53120
Attachments:
Description Flags
Test case
none
Another test case
none
Another test case none

Kiet Ho
Reported 2025-06-06 10:58:13 PDT
Created attachment 475498 [details] Test case See test case. When the same anchor-name is reassigned from one element to another, we don't invalidate the style of anchor-positioned elements that anchors to that anchor name.
Attachments
Test case (1.32 KB, text/html)
2025-06-06 10:58 PDT, Kiet Ho 		no flags
Details
Another test case (370 bytes, text/html)
2025-06-06 11:15 PDT, Kiet Ho 		no flags
Details
Another test case (1.29 KB, text/html)
2025-06-09 14:33 PDT, Kiet Ho 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2025-06-06 10:58:21 PDT
<rdar://problem/152727401>
Kiet Ho
Comment 2 2025-06-06 11:15:38 PDT
Created attachment 475499 [details] Another test case Another test case (may or may not be the same issue)
Kiet Ho
Comment 3 2025-06-09 14:33:27 PDT
Created attachment 475515 [details] Another test case In this test case, the anchor-positioned element anchors to anchor named --anchor. Initially, only #anchor-1 has that anchor name, so the anchor-positioned element should anchor to #anchor-1. After change(), both #anchor-1 and #anchor-2 has that anchor name. Because #anchor-2 is later in tree order, #anchor-2 wins out, and the anchor-positioned element should anchor to #anchor-2. This is the behavior in Chrome, but in Safari, the anchor-positioned element still anchors to #anchor-1
Kiet Ho
Comment 4 2025-06-11 20:08:55 PDT
Pull request: https://github.com/WebKit/WebKit/pull/46642
Antti Koivisto
Comment 5 2025-06-12 08:07:32 PDT
Pull request: https://github.com/WebKit/WebKit/pull/46661
EWS
Comment 6 2025-06-13 01:27:55 PDT
Committed 296184@main (16977f92e64a): <https://commits.webkit.org/296184@main> Reviewed commits have been landed. Closing PR #46661 and removing active labels.
Antti Koivisto
Comment 7 2025-06-13 01:47:52 PDT
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/53120
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