Pseudo elements (like ::backdrop) don't have an associated Element, so can't be found by ViewTransition's forEachElementInPaintOrder
<rdar://problem/126964779>
Pull request: https://github.com/WebKit/WebKit/pull/27674
Committed 278123@main (3ba31ee3b3d5): <https://commits.webkit.org/278123@main> Reviewed commits have been landed. Closing PR #27674 and removing active labels.