During the review process of bug 265936, Antti made this comment (https://github.com/WebKit/WebKit/pull/21385#discussion_r1417284307): "Optimally we would not even enter style update code if event generation is the only reason we are ticking." We should look into decoupling style resolution and animation event dispatch as reasons to schedule animation resolution so that we only do both of those things if necessary.
<rdar://problem/119611457>