title: html input range step as an array of values
body: <p>I've been playing around with the <code>input type=range</code> for the first time, and ideally I'd like to set the step value to an array of values. I looked over the spec and I see the possibility for a datalist but it seams the data list is only used for highlight values in a range, so to speak, but not setting the values in the range.</p>
  
  <p>So, something like this (ideally without a jQuery plugin, etc.):</p>
  
  <pre><code>&lt;input type="range" min="1" max="100" value="0" step="1,3,5,10,20"&gt;
  </code></pre>