https://drafts.csswg.org/css-view-transitions-1/#style-transition-pseudo-elements-algorithm
<rdar://problem/118703293>
Pull request: https://github.com/WebKit/WebKit/pull/24452
Committed 274817@main (810e27d205f5): <https://commits.webkit.org/274817@main> Reviewed commits have been landed. Closing PR #24452 and removing active labels.
Re-opened since this is blocked by bug 269743
Pull request: https://github.com/WebKit/WebKit/pull/24776
Committed 275005@main (066b75f5a58b): <https://commits.webkit.org/275005@main> Reviewed commits have been landed. Closing PR #24776 and removing active labels.