title: Adding classes to pseudo-elements
body: <p>So I'm using pseudo-elements to use a custom checkmark SVG, like this:</p>
  
  <pre><code>.thing:before {
      content: " ";
      background: $tickMarkURL;
      background-size: 1.5em;
      background-size: contain;
      width: 1.2em;
      height: 1.2em;
      display: inline-block;
  }
  </code></pre>
  
  <p>(note: this actually uses SCSS, so that's why there's $variables.)</p>
  
  <p>I want to use Animate.css to animate this checkmark into place. However, Animate.css uses classes to add animations to elements. I don't think that's possible with this pseudo-element (I think). Is there any other way to do it?</p>