The Sublime Text Website has some nifty animations to show of a few features. Turns out they’re not animated gifs.
One of the criteria was that the animations should work everywhere, from IE6 to an iPad. This ruled out two common video options, Flash and the
<video>element. Animated GIF files would have been a candidate, except for two issues: the 256 color limitation, which would have made the animations ugly, and the encoders I tried spat out huge files, at almost 1MB per-animation.