What type of issue is this?

Browser bug (a bug with a feature that may impact site compatibility)

What information was incorrect, unhelpful, or incomplete?

A few of the drag events, such as https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dragover_event suffer from
https://bugzilla.mozilla.org/show_bug.cgi?id=505521

Basically, the mouse coordinates are missing.

What browsers does this problem apply to, if applicable?

Firefox

What did you expect to see?

I expected the compatibility data to reflect on this.

(Ideally, I'd expect the correct people at Firefox to be notified about the bug, so that they can finally fix it. I'll happily donate 50 bucks or whatever is needed to make this happen.)

Did you test this? If so, how?

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

https://bugzilla.mozilla.org/show_bug.cgi?id=505521

I actually reported this in the past, but somehow the info from #4961 seems to have gotten lost

Do you have anything more you want to share?

No response

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dragover_event

MDN metadata