<button href="#" data-dropdown="drop1" aria-controls="drop1" aria-expanded="false" class="button dropdown">Dropdown Button</button><br>
<ul id="drop1" data-dropdown-content class="f-dropdown" aria-hidden="true">
  <li><a href="#">This is a link</a></li>
  <li><a href="#">This is another</a></li>
  <li><a href="#">Yet another</a></li>
</ul>