title: css3 background-size transition animation in Webkit doesn't work... Bug? Or wrong syntax?
body: <p>Animating the background-size property doesn't seem to be working in Chrome or Safari.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>div {
      width: 161px;
      height: 149px;
      background: url(http://3.bp.blogspot.com/_HGPPifzMEZU/Rw4ujF12G3I/AAAAAAAAAWI/bc1ppSb6eKA/s320/estrelas_09.gif) no-repeat center center;
      background-size: 50% 50%;
      transition: background-size 2s ease-in;
      -moz-transition: background-size 2s ease-in;
      -web-kit-transition: background-size 2s ease-in
  }
  div:hover {
      background-size: 100% 100%
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div&gt;
  hey
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p><a href="http://jsfiddle.net/ubcka/14/" rel="noreferrer">http://jsfiddle.net/ubcka/14/</a></p>