Great animation engines for Javascript? – Javascript/Animations

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I’m trying to implement a timeline based animation, where animations will be able to be:

  • paused
  • resumed
  • fast forwarded
  • slowed down
  • reversed
  • …

Are there any animation/tweening engines for Javascript that could be used for such purpose? Or that would be highly recommended?

Hwlp would be great, especially as this really interests me! =)