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I'm curious about what a "reasonably common supported set of ANSI escape codes” might be but I'm having a hard time finding a document that lays it out

I see the word “vt100" a lot but when I read about the vt100 in for example https://vt100.net/docs/vt100-ug/chapter3.html#S3.3 there's also some stuff that doesn't seem relevant to modern terminal emulators like "Load the four programmable LEDs..."

or there's ECMA-48 but is everything in there actually still used?

or there's the xterm sequences but that seems too big?