chromium/content/test/data/accessibility/aria/aria-hidden-changed.html

<!--
@WAIT-FOR:done
-->
<h4 id="stay-hidden" aria-hidden="true">Stay hidden</h4>
<h4 id="to-hidden"><div role=group><mark>xyz</mark></div>To hidden</h4>
<h4 id="from-hidden"><div role=group><mark>xyz</mark></div>From hidden</h4>
<script>
  document.addEventListener('DOMContentLoaded', () => {
    setTimeout(() => {
      document.getElementById('to-hidden').setAttribute('aria-hidden', 'true');
      document.getElementById('from-hidden').setAttribute('aria-hidden', 'false');
      document.title = 'done';
    }, 100);
  });
</script>