CSS defines 147 standard color names (red, tomato, rebeccapurple, midnightblue, etc.) that browsers translate to specific hex values. Originated from the X11 color list and standardized through CSS1, CSS3, and Color Level 4. Names like 'gray' and 'grey' are intentional aliases, both legal. Useful in code reviews and design discussions where 'tomato' is more memorable than '#FF6347'.
How to open
Type the name directly in any CSS property accepting a color: `color: tomato;`. Browser DevTools, Figma, and most design tools accept CSS color names in their color inputs.