The Cascading Style Sheets specification defines the same number of named colors as the HTML 4 spec, namely the 16 html colors, and 124 colors from the Netscape X11 color list for a total of 140 names that were recognized by Internet Explorer (IE) 3.0 and Netscape Navigator 3.0. Blooberry.com notes that Opera 2.1 and Safari 1 also included Netscape's expanded list of 140 color names, but later discovered 14 names not included with Opera 3.5 on Windows 98.
16,777,216 different color possibilities
With modern browsers supporting the full spectrum of 24-bit color, there are 16,777,216 different color possibilities. Use our color picker to explore all 16.7 million of them, or if that’s too many, check out our color charts for a selection of palettes focused on flat design, Material design and web safe colors.
Commonly used in websites and other software applications, there are a variety of formats: * HEX color codes * RGB color codes * HSL color codes * HTML color names
Color Names Supported by All Browsers.
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)