title: How do I set the current frame (or similar) of a CSS animation?
body: <p>I have a CSS keyframe animation that, in itself, is pretty ordinary.  However, <strong>I want to be able to force the animation to be at a particular frame.</strong>  Something like <code>anim.setProgress(0.13)</code>, which would set the animation to be 13% along.  <strong>How can I do that?</strong></p>
  
  <p>Note that I don't just want to <em>start</em> the animation at an arbitrary point.  I want to be able to interrupt it and say "go back to 32%" or something, regardless of how far along the animation is.</p>