zurb-foundation-5/doc/includes/split_button/examples_split_button_advanced.html

Foundation 5 for npm (no code modification from original repo)

<a href="#" class="small alert round button split">Split Button <span data-dropdown="drop223"></span></a><br>
<ul id="drop223" class="f-dropdown" data-dropdown-content>
  <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>