AnimationEffect has two subclasses: CustomEffect and KeyframeEffect. None of those have subclasses of their own, so they should both be marked final.
Pull request: https://github.com/WebKit/WebKit/pull/9922
Committed 260112@main (b84c65e04ccc): <https://commits.webkit.org/260112@main> Reviewed commits have been landed. Closing PR #9922 and removing active labels.
<rdar://problem/105281385>