Firefox ignores alert if parent has click handler

[eps1lon]

Steps to reproduce:

1. Goto https://oj1o9.csb.app/
2. Click "Show unnounced alert" (i.e. show <div onclick=""><div role="alert">message</div></div>

Note that the div is not clickable just because it has a click handler. The click handler is used for tracking clicks.

Actual behavior:

Alert is not announced

Expected behavior:

Alert is announced

This is the actual behavior when either

1. using Chrome (Version 96.0.4664.45)
2. not having an onclick handler on the parent div

System configuration

NVDA installed/portable/running from source:

NVDA version: 2021.2

Windows version: Version 10.0.22000 Build 22000 (OS Name Microsoft Windows 11 Pro N for Workstations)

Name and version of other software in use when reproducing the issue:

Firefox: 94.02

Other information about your system:

Other questions

Does the issue still occur after restarting your computer?

Have you tried any other versions of NVDA? If so, please report their behaviors.

No other versions tried

If NVDA add-ons are disabled, is your problem still occurring?

Yes

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

Yes

[Adriani90]

cc: @jcsteh it seems this affects only Firefox.

[jcsteh]

This is a Firefox bug: https://bugzilla.mozilla.org/show_bug.cgi?id=682811