Title is self-explanatory, but I\'ll provide a step-by-step view on the matter. Hopefully I\'m not the first one to have noticed this (apparently) bug on Webkit/Chrome.
I worked out a complete solution for this problem. It can be found here: https://stackoverflow.com/a/31093916/1520422
My solution restarts the animation WITHOUT re-loading the image data from the network.
It also enforces the image to repaint to fix some painting artefacts that occured (in chrome).