Here he noted that animated gifs are not supported – instead Geoff showed us a cool JS solution. This got me thinking ( and fiddling ). There must surely be a way with CSS only I thought. Maybe (ab)use @keyframe? And indeed that did the trick – paired with a couple of images ( one for each frame ).
I had 5 images – so I used 5 keyframes ( well 6 if you count 100% as a seperate one ). Here is the pen: