301510 2025-10-27 06:39:15 -0700 [CSS @starting-style] entry animation is only respected on first transition 2026-04-02 15:51:23 -0700 1 1 1 Unclassified WebKit Layout and Rendering Safari 26 Mac (Apple Silicon) macOS 26 RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=301461 InRadar P2 Normal --- 1 jh3yyy kiet.ho bfulgham fantasai.bugs graouts kiet.ho koivisto mic.gallego simon.fraser webkit-bug-importer zalan oldest_to_newest 2154436 0 jh3yyy 2025-10-27 06:39:15 -0700 hey there, raising this off of another one raised last week i've noticed that @starting-style entry/exit transitions aren't being respected as expected. not sure if this is a regression as i haven't seen this happen before (much like the issue i had with showing the non-modal dialog in the other issue i filed) Steps to Reproduce: 1. open the demo: https://codepen.io/jh3y/pen/RNrJEbw/b560906a4c78fda2f390fec86878e56f 2. open the dialog, note how the transform-origin is respected on the transition 3. close the dialog, note how it's a different transition 4. reopen the dialog, notice how the entry transition is now ignored and the exit is being reversed instead Actual Results: – entry transition is only respected on first play through Expected Results: – the entry and exit transitions should be respected on each playthrough 2154448 1 ap 2025-10-27 08:50:41 -0700 Thank you for the report, I can reproduce with STP 230. > not sure if this is a regression as i haven't seen this happen before Could you please elaborate? The dialog appears to be anchor-positioned, so the test relies on a new feature in Safari 26. Are you using a newer build, and unsure if this is a regression since Safari 26? 2154457 2 jh3yyy 2025-10-27 09:03:02 -0700 (In reply to Alexey Proskuryakov from comment #1) > Thank you for the report, I can reproduce with STP 230. > > > not sure if this is a regression as i haven't seen this happen before > > Could you please elaborate? The dialog appears to be anchor-positioned, so > the test relies on a new feature in Safari 26. Are you using a newer build, > and unsure if this is a regression since Safari 26? i figured this issue was related to @starting-style and i'm sure that's been around since before v 26 unless this is specific to the way dialog behaves? i was using popovers previous to this 🙏 2155964 3 webkit-bug-importer 2025-11-03 05:40:12 -0800 <rdar://problem/163928932> 2155999 4 graouts 2025-11-03 09:40:56 -0800 This is likely going to be a similar issue or a duplicate of bug 301461. I expect this is only happening with anchor positioning and starting style mixed together. 2156093 5 kiet.ho 2025-11-03 16:07:01 -0800 Might be fixed by bug 301461. 2156258 6 kiet.ho 2025-11-04 05:07:21 -0800 Pull request: https://github.com/WebKit/WebKit/pull/53392 2170724 7 ews-feeder 2026-01-09 11:07:56 -0800 Committed 305371@main (d9149b628100): <https://commits.webkit.org/305371@main> Reviewed commits have been landed. Closing PR #53392 and removing active labels. 2196409 8 kiet.ho 2026-04-02 15:51:23 -0700 *** Bug 301070 has been marked as a duplicate of this bug. ***