zurb-foundation-5/doc/includes/sidenav/examples_sidenav_mixin.html

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

<ul class="custom-side-nav">
  <li class="active"><a href="#">Link 1</a></li>
  <li><a href="#">Link 2</a></li>
  <li class="divider"></li>
  <li><a href="#">Link 3</a></li>
  <li><a href="#">Link 4</a></li>
</ul>