title: Why CSS Transitions -module does not support image-to-image transitions?
body: <p>I've read the spec for <a href="http://www.w3.org/TR/css3-transitions/" rel="nofollow noreferrer">CSS Transitions Module Level 3</a> and I'd like to know why it does not support image-based transitions.</p>
  
  <p>According to the draft, the background-image transitions are only supported when using with gradients. Both Webkit and Gecko seems to follow this practice.</p>
  
  <p>It's just that I see this as a major drawback. HTML 5 and CSS 3 could become the killer of Flash, but if I can't even transit between two images, I don't see how one could have beautiful menus without Flash.</p>