Re: [w3c/uievents] Need clarification how mouseenter/leave should behave while modifying DOM tree during event dispatch (#244)

On this [mouseevents test page](https://domeventviewer.com/mouse-event-viewer.html), if you enter from the right side (where the 3 divs align), you do get 3 `mouseenter` events when you enter "C". This is similar to the other example, but without the DOM mutation.

It's a bit concerning that Chrome/Firefox apparently have different paths for the corresponding mouse and pointer events.

Even if you ignore the DOM mutation, Safari interleaves the mouse/pointer events while Chome/Firefox group each type together. I think that interleaving them is more appropriate if we expect mouse and pointer events to be somewhat interchangeable.

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