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CSS Color Values
Cascading style sheets (CSS) support the color names and values listed above and also offer a number of other formats not available in HTML.
Three-Digit Hexadecimal Color Values
Under CSS, color values can be defined using three-digit hexadecimal color values, a concise version of the six-digit values just noted. This approach is supported by Internet Explorer 3 and higher and Netscape Navigator 4 and higher.
span {font-family: Helvetica; font-size: 14pt; color: #0CF;}
RGB Color Values
Under CSS, color values can be defined using RGB values. Colors are defined by the letters rgb, followed by three numbers between 0 and 255 that are contained in parentheses, separated by commas, and with no spaces between them. This approach is supported by Internet Explorer 4 and higher and Netscape Navigator 4 and higher.
p {color: rgb(204,0,51);}
RGB Color Values Using Percentages
Under CSS, RGB color values can also be defined using percentages. The format is the same, except that the numbers are replaced by percentage values between 0% and 100%. This approach is supported by Internet Explorer 4 and higher and Netscape Navigator 4 and higher.
p {color: rgb(75%,10%,50%);}