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chromium/content/test/data/accessibility/aria/aria-live-with-content.html 

<!--
@MAC-ALLOW-EMPTY:AXARIALive
@WIN-ALLOW:live*
@WIN-ALLOW:container*
@WIN-ALLOW:BUSY*
@BLINK-ALLOW:live*
@BLINK-ALLOW:container*
-->
<!DOCTYPE html>
<html>
  <body>
    <div role="marquee" aria-live="off">
      Off
    </div>
    <div role="marquee" aria-live="polite">
      Polite
    </div>
    <div role="marquee" aria-live="assertive">
      Assertive
    </div>
  </body>
</html>