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chromium/content/test/data/accessibility/html/list-item-level.html 

<!--
@BLINK-ALLOW:hierarchicalLevel*
-->
<html>
<body>
<ul>
  <li>Level 1, Item 1</li>
  <li>Level 1, Item 2</li>
  <ul>
    <li>Level 2a, Item 1</li>
    <li>Level 2a, Item 2</li>
      <ul>
        <li>Level 3, Item 1</li>
        <li>Level 3, Item 2
          <ul>
            <li>Level 4, Item 1</li>
            <li>Level 4, Item 2</li>
            <li>Level 4, Item 3</li>
          </ul>
        </li>
      </ul>
  </ul>
  <li>Level 1, Item 3
    <ul>
      <li>Level 2b, Item 1</li>
    </ul>
  </li>
  <li>Level 1, Item 4</li>
</ul>
<li>Level 1, Not within list group, Item 1</li>
<li>Level 1, Not within list group, Item 2</li>

<style>
  li {
    list-style: none;
  }
</style>
</body>
</html>