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HTML

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

<div class="row">
  <div class="columns">
    <h3>Responsive Menu - Drilldown Dropdown combo</h3>
    <p>A drilldown menu works well on mobile, but on medium/larger screens, you may want to convert that same menu into a dropdown. Here's an example that does just that:</p>
  </div>
</div>

<div class="row">
  <div class="columns">
    <ul class="vertical medium-horizontal menu" data-responsive-menu="drilldown medium-dropdown">
      <li>
        <a href="#">Item 1</a>
        <ul class="vertical menu">
          <li>
            <a href="#">Item 1A</a>
            <ul class="vertical menu">
              <li><a href="#">Item 1A</a></li>
              <li><a href="#">Item 1B</a></li>
              <li><a href="#">Item 1C</a></li>
              <li><a href="#">Item 1D</a></li>
              <li><a href="#">Item 1E</a></li>
            </ul>
          </li>
          <li><a href="#">Item 1B</a></li>
        </ul>
      </li>
      <li>
        <a href="#">Item 2</a>
        <ul class="vertical menu">
          <li><a href="#">Item 2A</a></li>
          <li><a href="#">Item 2B</a></li>
        </ul>
      </li>
      <li>
        <a href="#">Item 3</a>
        <ul class="vertical menu">
          <li><a href="#">Item 3A</a></li>
          <li><a href="#">Item 3B</a></li>
        </ul>
      </li>
    </ul>
  </div>
</div>

              
            
!

CSS

              
                /* Demo Styles */

body {
  padding: 2rem 1rem;
  background:#555;
  overflow-x:hidden;
  color: #fefefe;
}

a {
   background:#fefefe;
}

              
            
!

JS

              
                $(document).foundation();

// Patch for a Bug in v6.3.1
$(window).on('changed.zf.mediaquery', function() {
  $('.is-dropdown-submenu.invisible').removeClass('invisible');
});
              
            
!
999px

Console