Hovering is handled via the HTML/DOM event loop, since it needs to be coordinated with mouseover events. Animations, though, do need to be worked into this som

Hovering is handled via the HTML/DOM event loop, since it needs to be coordinated with mouseover events. Animations, though, do need to be worked into this somehow. And they need to be able to run on a completely independent event loop to some extent so you can do animations on the compositor thread, not the DOM thread.