[vincentriemer]

Another potential approach could be using the Web Animations API with an additive/relative animation approach via the `composite: 'add'` option. I say potential as it really only fully works in Chrome atm — Firefox has it but has weird rendering bugs and Safari says it has experimental support but I've never managed to get it working.

I like the potential of this approach as it lets you get smoother results than just CSS transitions yet doesn't require you to use a RAF loop-based animation library.