Demonstration and documentation

A linked tag A linked tag A not-so-important linked tag A linked tag A linked tag

<p>
    <span class="tag">Tags</span>
    <span class="tag">don't</span>
    <span class="tag">have to be</span>
    <span class="tag">links, but</span>
    <span class="tag">should never be alone</span>
    <span class="tag secondary-background">(and maybe non-links should be less colourful)</span>
  </p>