galaxy/client/docs/galaxy-menus.md

Popup menus

These are the classes for the menu itself, normally floating, so placed inside a relative element.

<div style="position: relative; height: 12rem;">
  <div class="popmenu-wrapper" style="top: 0;">
    <ul class="dropdown-menu">
      <li class="head"><a>Heading one</a></li>
      <li><a>An item</a></li>
      <li><a>Another item</a></li>
      <li class="head"><a>Heading two</a></li>
      <li><a>Third item</a></li>
      <li><a>Last item</a></li>
    </ul>
  </div>
</div>