Obviously that is why I said numbers not names as that (see link) basically was based on X11, I think Fred5 will be intending on using those CSS matches. CSS 2.1 has 17: aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, [orange], purple, red, silver, teal, white, and yellow. Though of course really you should avoid using those 'keywords' also.
The use of HTML elements and attributes for specifying colour is deprecated anyway so that usage should have stopped well over 10-years ago since the only places you could use the 'color' attribute was BASEFONT and FONT. LOL. The only other places you could apply colour values (keywords) being obviously: bgcolor, text, link, alink and vlink - again all deprecated for good reason. In otherwords use numbers not names.