how to make a list inside a list html code example

Example: nested list html

<ul>
  <!-- main item list -->
  <li>Coffee</li>
  <li>Tea
    <ul>
      <!-- items nested under tea -->
      <li>Black tea</li>
      <li>Green tea</li>
    </ul>
  </li>
  <li>Milk</li>
</ul>