AX: VoiceOver does not dispatch pointerdown/pointerup on buttons, only mousedown/mouseup/click

• Component: Accessibility
• Status: NEW ---

[Tim Guan-tin Chien [:timdream]]

Created attachment 409380 [details]
test case

STR:

1. Load the test case, a 

`<div
    id="test1"
    role=button
    tabindex="0"
>I am a role=button</div>`

with pointerdown/pointerup/mousedown/mouseup/click event listeners installed

2. Open up the DevTools console
3. Focus on the div and VO+space
4. Inspect the console output

Expected:

1. I should see

[Log] test1 pointerdown (voiceover-test.html, line 23)
[Log] test1 mousedown (voiceover-test.html, line 21)
[Log] test1 pointerup (voiceover-test.html, line 24)
[Log] test1 mouseup (voiceover-test.html, line 22)
[Log] test1 click (voiceover-test.html, line 25)

Just like what I will see when I click on the div with a mouse cursor

Actual:

I am seeing

[Log] test1 mousedown (voiceover-test.html, line 21)
[Log] test1 mouseup (voiceover-test.html, line 22)
[Log] test1 click (voiceover-test.html, line 25)

where pointer events are missing.

[Radar WebKit Bug Importer]

<rdar://problem/69383188>

[Tim Guan-tin Chien [:timdream]]

Created attachment 413598 [details]
voiceover-test-window.html

Further test shows that VO does dispatch pointer events only under this condition:

- When the pointer event listeners are attached to window.
- When there isn't any mouse event listeners attached.
- When VO key is applied on a `aria-label` not a `role=button`.

This is very inconsistent and confusing...