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chromium/content/test/data/accessibility/event/live-region-remove.html 

<!DOCTYPE html>
<html>
<body>
<div id="live" aria-live="polite"><p id="p">Before</p></div>
<script>
  function go() {
    var p = document.getElementById('p');
    p.parentElement.removeChild(p);
  }
</script>
</body>
</html>