navbar_switcher.html

<div class="version-switcher__container dropdown">
 <button class="version-switcher__button btn btn-sm navbar-btn dropdown-toggle" data-toggle="dropdown" type="button">
  0.7.1
  <!-- this text may get changed later by javascript -->
  <span class="caret">
  </span>
 </button>
 <div class="version-switcher__menu dropdown-menu list-group-flush py-0">
  <!-- dropdown will be populated by javascript on page load -->
 </div>
</div>