<ol class="tree">
  <li class="file">
    <a href="root"><span class="icon"></span>root</a>
  </li>
  <li>
    <label>folder0</label>
    <input type="checkbox" />
    <ol>
      <li class="file">
        <a href="folder0/0"><span class="icon"></span>0</a>
      </li>
    </ol>
  </li>
  <li>
    <label>folder1</label>
    <input type="checkbox" />
    <ol>
      <li class="file">
        <a href="folder1/1"><span class="icon"></span>1</a>
      </li>
    </ol>
  </li>
</ol>
