title: setInterval() not working with rotate
body: <p>I have an image. I have written some code that will rotate it over en over,
  but the <code>setInterval()</code> function is not working. </p>
  
  <p>Please can you tell me why?</p>
  
  <pre><code>var star = document.getElementById('star');
  setInterval(function() {star.style.transform = "rotate(10deg)"; },10);
  </code></pre>