HTML Color Name and Color Code
HTML supports 147 colors specification in which 16 of the colors derived from VGA color specification and the rest from the X11 color name scheme.
Below are the complete list of color names along with its hex and decimal value. You can directly use Hexdecimal codes or name of color in html or CSS.
Some other colors that are not part of of HTML or XHTML but they still are supported by most of the versions of major browsers. The following table display all the colors available in X11 color set that are accepted by all atandard browsers which following W3C standards.
X11 Color Names (W3C color names)