Useful post on the w3schools website.
All modern browsers support the following 140 color names (click on a color name, or a hex value, to view the color as the background-color along with different text colors):
The site is well worth a visit calling itself the world’s largest web developer site it is a mine of useful information. It has tutorials alongside demos and also a useful try it yourself area. It is well laid out and easy to use as a site.