HTML and CSS Reference
The popular browsers go well beyond the standard and support the sev-
eral hundred color names defined for use in the X Window System. Note
that these color names may contain no spaces; also, the word gray may
be spelled grey in any color name.
Those colors marked with an asterisk (*) actually represent a family of
colors numbered one through four. Thus, there are actually four vari-
ants of blue, named "blue1," "blue2," "blue3," and "blue4," along with
plain old "blue." Blue1 is the lightest of the four; blue4 is the darkest.
The unnumbered color name is the same color as the first; thus, blue
and blue1 are identical.
Finally, if all that isn't enough, there are 100 variants of gray (and grey),
numbered 1 through 100. "Gray1" is the darkest, "gray100" is the light-
est, and "gray" is very close to "gray75."
The extended color names are: