title: Changing a css attribute starting with a dash using Javascript
body: <p>I'm trying to use the ussual method of changing a css property with javascript. The problem is that the webkit based attributes start with a dash making the javascript invalid. </p>
  
  <pre><code>document.getElementById('circle1').style.-webkit-animation = 'upDown 15s infinite';
  </code></pre>
  
  <p>How can I modify this code to be valid.</p>