[Webkit-unassigned] [Bug 276553] New: AX: live region does not announce if it is outside of a dialog with aria-modal=true

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=276553

            Bug ID: 276553
           Summary: AX: live region does not announce if it is outside of
                    a dialog with aria-modal=true
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dm_mazzoni at apple.com
                CC: andresg_22 at apple.com,
                    webkit-bug-importer at group.apple.com

Setting a dialog to aria-modal=true causes everything else on the page to be ignored. That means that live region events outside of the dialog get dropped, even though they might be visible.

Quick repro - if you get rid of aria-model="true" this works fine.

<div role="dialog" aria-label="My dialog" aria-modal="true" tabindex="-1" style="border: 1px solid #000; padding: 1em;">
  <button id="b" autofocus>Announce</button>
</div>

<div aria-live="polite" id="live"></div>

<script>
  document.getElementById('b').addEventListener('click', () => {
      document.getElementById('live').innerText = 'Hello';
  });
</script>

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