Animated PNG seems to be the least-bad option that covers every key GIF feature, and most importantly will be supported by every major browser once Edge-Chromiu

Animated PNG seems to be the least-bad option that covers every key GIF feature, and most importantly will be supported by every major browser once Edge-Chromium ships: https://www.caniuse.com/#feat=apng https://www.caniuse.com/#feat=apng