chromium/content/test/data/accessibility/regression/reentrant-add-children.html

<!DOCTYPE html>
<!--
  This piece of markup used to produce a re-entry in AXNodeObject::AddChildren()
  for the same node.
-->
<div id="container">
  <h6 id="heading" role="heading"></h6>
  <br id="blank" tabindex="0" autofocus></br>
</div>