Codebase Browser
chromium
Go to App

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

<!DOCTYPE html>
<!--
@BLINK-ALLOW:liveStatus*
@BLINK-ALLOW:containerLiveStatus*
-->
<html>
  <body>
    <div role="group" aria-live="polite">
      <div role="group" aria-live="off">
        Nested - off
      </div>
    </div>
    <div role="group" aria-live="off">
      <div role="group" aria-live="polite">
        Nested - polite
      </div>
    </div>
    <div role="group" aria-live="polite">
      <div>
        <div role="group" aria-live="assertive">
          Nested - assertive
        </div>
      </div>
    </div>
  </body>
</html>