Nested HTML Lists

gistfile1.html

<!-- INCORRECT -->
<ul>
  <li>First bulleted item</li>
  <li>Second bulleted item</li>
  <ol>
    <li>First nested number</li>
  </ol>
</ul>

<!-- CORRECT -->
<ul> <!-- ul is the parent element -->
  <li>First bulleted item</li>
  <li> <!-- li is a direct child of ul -->
    Second bulleted item
    <ol> <!-- ol is a direct child of li, which is a direct child of ul -->
      <li>First nested number</li>
    </ol>
  </li>
</ul>