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> * Don't use color as the only indication of something. The user's terminal might not display it

The user may be colour-blind (30% of the population). The user may be completely blind and relying on a screen reader.

30%? As far as I know, about 10% of male population has red-green deficiency, in females it's much rarer, and and all the other forms of colorblindness are very rare regardless of sex.

Colourblindness is <10% of the population. But yes, quite right it's not a good idea to rely on colour as the sole indication of something important.

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