Mouse events on disabled input elements

[jgraham]

Description
The spec requires that disabled form controls don't receive click events. Gecko follows this and also prevents further event propogation, but other browsers apply it to all mouse events and allow further event propogation (I think; more comprehensive tests are required). This has created a number of serious site compatibility issues.

Bug reports
https://bugzilla.mozilla.org/show_bug.cgi?id=1653882
https://webcompat.com/issues/65773
webcompat/web-bugs#73699
webcompat/web-bugs#72988

Specification
https://html.spec.whatwg.org/multipage/forms.html#enabling-and-disabling-form-controls:-the-disabled-attribute
whatwg/html#2368

Tests
https://wpt.fyi/results/html/semantics/forms/attributes-common-to-form-controls/disabled-elements-01.html?label=master&label=experimental&aligned but this case isn't covered.

This is a bug to include in #9

[gsnedders]

This also appears in #11 (comment), albeit linking to further tests in https://wpt.fyi/results/dom/events/Event-dispatch-click.html?label=experimental&label=master&aligned (though again doesn't test propagation AFAICT).

[foolip]

I've added the requires:tests label but presume that added a test is fairly trivial, so that's not a blocker in my mind.

[josepharhar]

I'm happy to work on this in chromium in 2022.

https://wpt.fyi/results/html/semantics/forms/attributes-common-to-form-controls/disabled-elements-01.html?label=master&label=experimental&aligned but this case isn't covered.

https://wpt.fyi/results/dom/events/Event-dispatch-click.html?label=experimental&label=master&aligned (though again doesn't test propagation AFAICT).

So between disabled-elements-01.html and Event-dispatch-click.html we still are missing a case?

though again doesn't test propagation AFAICT

Could you elaborate the propagation case? I'd be happy to add test coverage

[jgraham]

https://bugzilla.mozilla.org/show_bug.cgi?id=1653882#c14 is relevant to this issue.