Currently only AnimationPlaybackEvent has the notion of a scheduled event time but, in order to fix bug 235145, we'll need to add that notion to CSS Animations and CSS Transitions events as well. So it would make sense to promote it to AnimationEventBase such that all the animation event subclasses benefit from it.
Pull request: https://github.com/WebKit/WebKit/pull/6837
Committed 257048@main (7602b29151e9): <https://commits.webkit.org/257048@main> Reviewed commits have been landed. Closing PR #6837 and removing active labels.
<rdar://problem/102693547>