https://drafts.csswg.org/css-view-transitions/#handle-transition-frame-algorithm
<rdar://problem/118705652>
Pull request: https://github.com/WebKit/WebKit/pull/24918
Committed 275156@main (0ee25f18f0a0): <https://commits.webkit.org/275156@main> Reviewed commits have been landed. Closing PR #24918 and removing active labels.