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by Sesse__ 250 days ago
They are not allowed to loop or recurse, so no, by themselves, they are not (unless you accept repeating the function a potentially infinite amount of time).

CSS in general is Turing complete if you allow running multiple frames, although it requires ugly hacks. See e.g. https://codepen.io/propjockey/pen/dywNyBQ, which is quite insane IMO.