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If you use the 14 standard colours (the plain old colours minus black and white), shouldn't they be set to something readable in the terminal emulator configuration? Of course, the 256-colour mode should not be used. And how do you check the background?

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No, not simultaneously usable as foreground and background colours. For instance, on a light background, the default yellow is a good ‘highlighter’ background. If yellow is reconfigured to be dark enough to be usable as a foreground colour (i.e. brown), it's no longer usable as a background. You can't have both, and you can't assume the user has picked one or the other.

> And how do you check the background?

OSC 11

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