295009 2025-06-25 19:54:03 -0700 [css-anchor-position-1] Fallback options are not "sticky" 2025-08-16 02:29:44 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Local Build Unspecified Unspecified RESOLVED FIXED https://github.com/web-platform-tests/wpt/pull/54345 InRadar P2 Normal --- 289743 291856 1 fantasai.bugs kiet.ho bfulgham fantasai.bugs kiet.ho simon.fraser webkit-bug-importer zalan oldest_to_newest 2125932 0 fantasai.bugs 2025-06-25 19:54:03 -0700 Overview: By default, the position-try fallbacks are "sticky", i.e. an option is used until it's invalidated either because a) it no longer fits b) there's a style recalculation that triggers re-evaluation of position-try options This behavior is intended to provide some visual stability for the user. Affected WPT Tests: * http://wpt.live/css/css-anchor-position/last-successful-basic.html * http://wpt.live/css/css-anchor-position/last-successful-change-fallbacks.html * http://wpt.live/css/css-anchor-position/last-successful-change-try-rule.html * http://wpt.live/css/css-anchor-position/last-successful-iframe.html * http://wpt.live/css/css-anchor-position/last-successful-intermediate-ignored.html Specification Notes: See https://www.w3.org/TR/css-anchor-position/#fallback It's possible that we might find places where the spec should be adjusted, since we are the second implementation and what makes sense to do here might not be entirely obvious. In these cases we should implement what makes sense to us and bring the issue to the CSSWG for discussion. 2125933 1 webkit-bug-importer 2025-06-25 19:54:29 -0700 <rdar://problem/154352444> 2134813 2 kiet.ho 2025-08-06 17:27:43 -0700 Pull request: https://github.com/WebKit/WebKit/pull/49037 2136667 3 ews-feeder 2025-08-14 17:13:54 -0700 Committed 298718@main (87540245e449): <https://commits.webkit.org/298718@main> Reviewed commits have been landed. Closing PR #49037 and removing active labels. 2136685 4 kiet.ho 2025-08-14 18:32:02 -0700 Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/54345 2136983 5 kiet.ho 2025-08-16 02:29:44 -0700 <rdar://problem/158452223>