Summary: Pointer Events defines `|click|`, `auxclick`, `contextmenu`
event target should be the same target as its source event if and only
if the source event is a `|pointerdown|` or a `|pointerup|` and the
pointer is captured at dispatching the source event (the source event of
`|contextmenu|` may be `|pointerdown|`, which depends on when the OS
dispatches the native `|contextmenu|`). Currently, we conform to the
case when the source event is `pointerup`.
I.e., we change the behavior when:
* pressing and releasing a button of mouse and the web app explicitly
capture the mouse
* single tapping and the web app explicitly capture the touch
* single tapping and the web app does not release the implicit capture
of the touch (the traditional behavior for a tap)
So, we don't change the behavior when:
* pressing and releasing a button of mouse and the web app does not
capture the mouse (the traditional behavior for a mouse button press)
* single tapping and the web app explicitly release the capture of the
touch
* pressing the secondary button of mouse and `|contextmenu|` is dispatched
This means that we don't change the traditional behavior of the mouse click.
Finally, we need to fix the last case, i.e., `|contentmenu|` dispatched
without `|pointerup|` in a follow up bug.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1885232
Specification: https://w3c.github.io/pointerevents/#event-dispatch (the
last paragraph of the step #3)
Preferences:
`|dom.w3c_pointer_events.dispatch_click_on_pointer_capturing_element|`
web-platform-tests:
https://wpt.fyi/results/pointerevents?label=master&label=experimental&aligned&q=pointerevent_click_during_capture
<https://wpt.fyi/results/pointerevents?label=master&label=experimental&aligned&q=pointerevent_click_during_capture>
--
Masayuki Nakano<[email protected]>
Working on DOM, Events, editor and IME handling for Gecko
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