[whatwg/dom] Why does `preventDefault()` in pointer events break mouse events? (#917)

Here's a working demo:

https://codepen.io/trusktr/pen/gOMjELg

In the following demo, `event.preventDefault()` is called in a `pointerdown` event, and that inexplicably breaks `mouseup` events.

https://codepen.io/trusktr/pen/GRqBeWr

It has been a source of difficult-to-track bugs in an application of mine. It really isn't intuitive that one set of events (`pointer*` events) has such an effect on an unrelated set of events (`mouse*` events).

And even if `pointer` and `mouse` events are treated as if they belong together, it is not at all clear why `event.preventDefault()` within `*down` event handlers should stop `*up` event handlers from firing.

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