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              <!-- This demo uses float grid but you can use flex grid too -->

<div class="row">
  <div class="columns">
    <h2>Drilldown Menu</h2>
    <p>Popularized by iOS, Drilldown menu is a series of nested lists which converts itself into a vertical drilldown menu.</p>
    <div class="primary callout">
      <p>The drilldown menu takes on the height of the tallest menu in the hierarchy, so the menu doesn't change height as the user navigates it.</p>
    </div>
  </div>
</div>

<div class="row">
  <div class="columns">
    <ul class="vertical menu" data-drilldown style="width: 200px" id="m1">
      <li>
        <a href="#0">Item 1</a>
        <ul class="vertical menu" id="m2">
          <li>
            <a href="#0">Item 1A</a>
            <ul class="vertical menu" id="m3">
              <li><a href="#0">Item 1Aa</a></li>
              <li><a href="#0">Item 1Ba</a></li>
              <li><a href="#0">Item 1Ca</a></li>
              <li><a href="#0">Item 1Da</a></li>
              <li><a href="#0">Item 1Ea</a></li>
            </ul>
          </li>
          <li><a href="#0">Item 1B</a></li>
          <li><a href="#0">Item 1C</a></li>
          <li><a href="#0">Item 1D</a></li>
          <li><a href="#0">Item 1E</a></li>
        </ul>
      </li>
      <li>
        <a href="#0">Item 2</a>
        <ul class="vertical menu">
          <li><a href="#0">Item 2A</a></li>
          <li><a href="#0">Item 2B</a></li>
          <li><a href="#0">Item 2C</a></li>
          <li><a href="#0">Item 2D</a></li>
          <li><a href="#0">Item 2E</a></li>
        </ul>
      </li>
      <li>
        <a href="#0">Item 3</a>
        <ul class="vertical menu">
          <li><a href="#0">Item 3A</a></li>
          <li><a href="#0">Item 3B</a></li>
          <li><a href="#0">Item 3C</a></li>
          <li><a href="#0">Item 3D</a></li>
          <li><a href="#0">Item 3E</a></li>
        </ul>
      </li>
      <li><a href='#0'> Item 4</a></li>
    </ul>
  </div>
</div>
            
          
!
            
              /* Demo Styles */

body {
  padding: 2rem 1rem;
}
            
          
!
999px
Loading ..................

Console