1501921 - mouseenter/mouseleave are not fired on tap in Gecko

Status: RESOLVED INVALID

(Core :: DOM: Events, defect)

Description

[Karl Dubost💡 :karlcow]

To reproduce.
1. Enable touch events on Firefox (Through responsive design mode if you wish)
2. Go to https://w3c.github.io/uievents/tools/mouse-event-viewer.html
3. Tap ONCE green area.

The sequence will be:

1. mousedown
2. mousemove
3. mouseup

Do the same thing with chrome with touch mode on

The sequence will be

1. mouseover
2. mouseenter  (*)
3. mousemove
4. mousedown
5. mouseup

The (*) mouseenter is why I'm reporting this here. 
This might create a Webcompat issue on the site (I'm not 100% sure yet).
https://webcompat.com/issues/14287

Brian Birtles helped me find the references here. (Thanks!)

It doesn't seem to be clearly defined in any of these places:
https://w3c.github.io/uievents/#event-type-mouseenter
https://w3c.github.io/pointerevents/#the-pointerenter-event
https://w3c.github.io/touch-events/#mouse-events

Chrome added it in https://bugs.chromium.org/p/chromium/issues/detail?id=457497
see the discussion in 
* https://lists.w3.org/Archives/Public/public-touchevents/2015Feb/0024.html
* https://www.w3.org/2015/02/17-touchevents-minutes.html#item01

Comment 1

[Karl Dubost💡 :karlcow]

hmmm… spoke too fast?
On an actual windows machine with a touch screen, mouseenter is fired on tap.
But it's not on RDM with touch events on.

Comment 2

[Karl Dubost💡 :karlcow]

so on Firefox Android device I checked with
https://w3c.github.io/uievents/tools/mouse-event-viewer.html and mouseenter is fired. So that's not the cause of the issue and I guess we can close this issue. as invalid because it's already working.

Sorry about that.

Comment 3

[Olli Pettay [:smaug][[e-mail]]]

File a devtools issue on RDM? I've heard it has other event handling issues too.

Comment 4

[Karl Dubost💡 :karlcow]

I will do Olli. Thanks!

Comment 5

[Karl Dubost💡 :karlcow]

Reported in Bug 1501939