[robin_reala]

…which makes me wonder if CSS animation on stacked divs would be more efficient too?

[martin-adams]

...or an animated GIF

[PavlovsCat]

If you layer several animations with varying and carefully selected run times over each other, the result never exactly repeats itself. Good luck recreating that with one GIF animation :D

[tvararu]

An animated GIF would weigh a lot more.