title: What does does the z-index value 'unset' do?
body: <p>According to the <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/z-index" rel="nofollow noreferrer">MDN docs on z-index</a>, one possible z-index value is 'unset'. </p>
  
  <pre><code>/* Global values */
  z-index: inherit;
  z-index: initial;
  z-index: unset;         /* &lt;-------- */
  </code></pre>
  
  <p>What does using that value do?</p>