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But with less comedic value. Doing this with nothing but box-shadow is funny, mostly because it is so impractical.

Canvas throws away a lot though, especially w accessibility

Really? I would have guessed that canvas provides pretty much exactly the same accessibility as a UI rendered entirely out of box shadows.

now I'm imagining a screen reader reading off the coordinates of 1000 box shadows

You could probably get it to png encode a canvas and then read it in hex too.

Canvas is better...if you're trying to do something that stays within a fixed-size box.

Canvas would still be faster even if you used a full-screen box. Just the string concatenation overhead of doing this with box-shadows is insanely wasteful.

Which isn't to demerit the hackish creativity of taking one thing and running with it! But if you wanted to do a ball painting effect like that outside this "what if" context, it would be technically irresponsible to do it with box-shadows.

Sure, and we already have keyboards, so there's no need to use floppy drives or rubber chickens to make music either.