Bug 305642

Summary: [threaded-animations] REGRESSION: Animations jitter after device rotation on https://codepen.io/utilitybend/full/RwqBymL
Product: WebKit Reporter: Antoine Quint <graouts>
Component: AnimationsAssignee: Antoine Quint <graouts>
Status: RESOLVED FIXED    
Severity: Normal CC: graouts, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on:    
Bug Blocks: 303641    

Antoine Quint
Reported 2026-01-16 07:35:38 PST
On an iPad and a ToT build with Threaded Scroll-driven Animations enabled, go to https://codepen.io/utilitybend/full/RwqBymL and scroll around a bit, noticing the behavior is as expected. Now rotate your device to whatever is the alternate orientation, and notice how there's all kind of jittering. This works fine with Threaded Scroll-driven Animations disabled.
Attachments
Antoine Quint
Comment 1 2026-01-16 07:35:49 PST
Antoine Quint
Comment 2 2026-01-16 07:44:43 PST
EWS
Comment 3 2026-01-16 10:37:47 PST
Committed 305721@main (f9a893b0dbef): <https://commits.webkit.org/305721@main> Reviewed commits have been landed. Closing PR #56711 and removing active labels.
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