They can? Is this a recent thing? I remember wanting to detect the background colour years ago, and not finding any way to do it.

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JoshTriplett 7 hours ago | parent [-]

It's not recent, and most terminals support it. You send an escape sequence to the terminal, and get back a sequence that tells you the exact background color.

	▲	takluyver 6 hours ago \| parent [-]
		Huh, indeed. I still can't find much information about this, but this page is very informative: https://jwodder.github.io/kbits/posts/term-fgbg/