[eyelidlessness]

CSS definitely has iterations. Animations are the most obvious, but you could definitely build a state machine which progressively passes through and even recurses on state with custom properties (“variables”) and various conditional interactions from media/container queries.

I’m not inclined to do this, because I have way too long a list of higher priorities, but I could possibly be nerd sniped into showing some proofs of concept if the idea sounds outlandish.