[TECH] CSS 2.4 use numbers not names for colors

2.4 in the CSS tech doc says:
 
Use numbers, not names, for colors.
I think one of the great things about CSS is its simplicity, including use
of real language. I think that, in a way, it is an accessibility issue for
web designers who may have cognitive disabilities. I recommend we remove
this recommendation.
Cheers
David MacDonald
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 .barriers disable them.
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