David Anderson [:dvander] - inactive, e-mail if emergency Reporter
	Description • 9 years ago

APZ changes preventDefault behavior for wheel events in two ways: one, the start of a transaction (which is somewhat arbitrary) determines the preventDefault() status for the entire transaction, and two, APZ will stop waiting on content if it takes longer than 300ms.

Chrome appears to not do either of these things. I don't know how much we can get away with, but I'll attach two test cases for posterity.

If we do change it, we should consider only changing it for trackpads that don't send start/stop events (which unfortunately is most Windows devices).

	David Anderson [:dvander] - inactive, e-mail if emergency Reporter
	Comment 1 • 9 years ago

On this test, every other wheel event should be preventDefaulted. Chrome passes, Firefox APZ usually ignores the preventDefaults.

	David Anderson [:dvander] - inactive, e-mail if emergency Reporter
	Comment 2 • 9 years ago

This test case tries to time out APZ, then preventDefaults. Chrome doesn't have a timeout, so it doesn't scroll. Firefox does scroll.

	Botond Ballo [:botond]
	Comment 3 • 8 years ago

David, do you have any plans to fix this?

	David Anderson [:dvander] - inactive, e-mail if emergency Reporter
	Comment 4 • 8 years ago

No. Last I recall we decided we weren't worried about this.