<h4>Hidden on...</h4>
<ul class="responsive-utilities-test hidden-on">
  <li>Phone<span class="hidden-phone">✔ Phone</span></li>
  <li>Tablet<span class="hidden-tablet">✔ Tablet</span></li>
  <li>Desktop<span class="hidden-desktop">✔ Desktop</span></li>
</ul>
<ul class="responsive-utilities-test hidden-on">
  <li>Phone + Tablet<span class="hidden-phone hidden-tablet">✔ Phone + Tablet</span></li>
  <li>Tablet + Desktop<span class="hidden-tablet hidden-desktop">✔ Tablet + Desktop</span></li>
  <li>A