The following colors are defined in the CSS1 standard. The left half of each bar is generated with the numeric color code, the right half with the color name. Absence of a visible border shows the two definitions are the same. Click on any color bar for a color test.
CSS Color List
W3C has expanded the list of CSS with 130 additions. Here they are in alphabetical order.
Sorted Color List
Here are all of the colors sorted in order of the NTSC Luminance function Red×0.30 + Green×0.59 + Blue×0.11.