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I had a similar thought. I thought "wow, believable!" but not to be flippant, the initial wow was genuine.

Yeah, that was exactly my thought too, but then I've been doing web dev for 20 years so obviously it wouldn't come as much of a surprise to me that this is possible.

I guess not all people are in the same boat though, and I suppose it is quite cool how much can be done with CSS these days! (not that you would necessarily want to).

You could embed JS into CSS in 1999 in IE5 so CSS has always been a lot of "you can do a lot of weird things."

The ease of dropping in a "useState" and high-ish performance js engines has made high-level CSS wizardry a bit of a lost art.