<ul>
  <li><a href="1.html#1" class="active page">1</a>
  <ul>
    <li><a href="1/a.html" class="page">1/a</a></li>
    <li><a href="1/b.html" class="page">1/b</a></li>
  </ul></li>
  <li><a href="2.html" class="page">2</a></li>
</ul>
