chromium/content/test/data/accessibility/html/aside.html

<!--
@BLINK-ALLOW:hierarchicalLevel*
@MAC-ALLOW:AXRoleDescription
@WIN-ALLOW:xml-roles*
@AURALINUX-ALLOW:xml-roles*
-->
<!DOCTYPE html>
<html>
<body>

<p>The aside tag defines some content aside from the content it is placed in.</p>
<aside>
  <h4>Body aside</h4>
  <p>The aside content should be related to the surrounding content.</p>
</aside>

<main>
  <p>The main content</p>
  <aside>
    <h4>Main aside</h4>
    <p>The aside content should be related to the surrounding content.</p>
  </aside>
</main>

</body>
</html>