Colour & Visually Impaired

Unlike the CBC,

the BBC has text versions of their pages.

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Notably, it is also possible to change screen & text colour on BBC
text pages.

Few web pages recognize that some of us use text only browsers.
Many do however, have text versions for the visually impaired.

Although I enjoy the BBC's colour selection option, I am not sure how that
choice would help visually impaired.

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Bold, italics, or underlined might be recognized by some speech
recognition programmes as emphasis clues.

Although I am sure it has not happened, it might be useful to use colour
to indicate tone or mood. Might blue indicate
depression, red, a form of
anger, yellow fear,
and purple pomposity?

Dogs & cats of course would not be able to read pages so marked.