Animated GIFs the Hard Way
Doesn't GIF already have a differential animation mode since you can set unchanged pixels in each frame to transparent? e.g. http://www.imagemagick.org/Usage/anim_opt/#opt_transWith PNG24 you'd at least get better colour depth. In which case why not use the same Dispose None technique in APNG (https://wiki.mozilla.org/APNG_Specification#.60fcTL.60:_The_...) and a polyfill (https://github.com/davidmz/apng-canvas) to provide cross-browser support?Actually it might be preferable to always use the polyfill if you want to do something like the Apple thing where you can scrub around the video. Still doesn't have I-Frames to do frame-skip during fast movements though.