Re: [w3c/uievents] Consider to make mouseenter/leave (and pointerenter/leave) uncomposed (#208)

Remember, there are several mouseenter events per single mousemove if the subtree height > 1.

 In (1), there is one event on C, separate event on shadow-host and separate event on A. (in fact, it is not defined, whether to dispatch separate event also on shadow root.)

(2) is not interesting for this issue, nor (3)

A isn't the target ea.com uses, but shadow-host. And in (1) it gets several events.
The one dispatched to C, which, although is capture only, is handled also at AT_TARGET phase on shadow-host, meaning also listeners on bubble phase are called. But there is separate event dispatched to shadow-host itself.


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