Should DragEvent be upgraded to a PointerEvent?

[RByers]

Split off from #100. Unlike click etc., Edge still uses MouseEvent for dragstart etc.

[smaug----]

MouseEvent for dragstart? Are you sure about that? Wouldn't dnd be rather broken if DragEvent wasn't used.
Isn't upgrading existing events actually a bit regression risky. That changes the prototype chain.
Though, I guess we want to support dnd somehow using touch.

[RByers]

Sorry, what I meant to say is that DragEvent inherits just from MouseEvent, not PointerEvent.

Yes, there's definitely some compat risk here. Is it much worse than in #100 though (which apparently Edge has already shipped without issue)?

[NavidZ]

We talked about this in the call. There are some advantages to this such as having pointerId and pointerType for multiple dragging at the same time but there are also some complications like handling of setPointerCapture. Pushing this to V3 to further discuss this.

[patrickhlauke]

Discussed in the PEWG call today https://www.w3.org/2020/08/19-pointerevents-minutes.html. @smaug---- filed issue against HTML spec. Closing issue here.