WebKit has some unique failures for css/css-animations/event-order.tentative.html. See https://wpt.fyi/results/css/css-animations/event-order.tentative.html?label=experimental&label=master&aligned.
<rdar://problem/87785713>
I think to pass this we need to adopt the scheduled event time approach we implemented in bug 191187.
Pull request: https://github.com/WebKit/WebKit/pull/6858
Committed 257080@main (9d465450dccf): <https://commits.webkit.org/257080@main> Reviewed commits have been landed. Closing PR #6858 and removing active labels.