<!--
  @UIA-WIN-DENY:*
  @UIA-WIN-ALLOW:ExpandCollapse*
  @UIA-WIN-ALLOW:AriaProperties*
-->
<!DOCTYPE html>
<html>
<body>
<a role="link" aria-expanded="false" id="title" href="#">Toggle</a>
<ul id="list" aria-label="list" style="visibility: hidden;">
  <li aria-label="list item 1">ListItem 1</li>
  <li aria-label="list item 2">ListItem 2</li>
  <li aria-label="list item 3">ListItem 3</li>
</ul>
<script>
  function go() {
    document.getElementById('list').style.visibility = 'visible';
    document.getElementById('title').setAttribute('aria-expanded', 'true');
  }
</script>
</body>
</html>