phone/css/font-awesome-4.7.0/src/_includes/tests/stacked-with-text.html
a3a19fc6 
 <span class="fa-stack" aria-hidden="true">
   <i class="fa fa-calendar-o fa-stack-2x"></i>
   <span class="fa-stack-1x padding-top-sm">27</span>
 </span>