title: How to format the audio tag in Ruby Slim?
body: <p>This is the HTML audio tag:</p>
  
  <pre><code>&lt;audio controls autoplay loop muted&gt;
  &lt;source src="horse.ogg" type="audio/ogg"&gt;
  &lt;source src="horse.mp3" type="audio/mpeg"&gt;
  Your browser does not support the audio tag.
  &lt;/audio&gt;
  </code></pre>
  
  <p>How is this written in Slim code, including the control, auto play and loop attributes?</p>