The hex number is prefixed with a hash character ( #) and can be three or six digits in length. We are generally used to the decimal number system ( base-10, from 0 to 9), but hexadecimal has 16 digits, from 0 to f. Hexadecimal (previously and more accurately known as “ sexadecimal”) is a base-16 number system. The three values in the RGB value are from 0 to 255, 0 being the lowest level (no red, for example), 255 being the highest level (full red, for example). With the possible exception of black and white, color names have limited use in a modern, well-designed web sites because they are so specific and limiting. Predefined color names include aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, purple, red, silver, teal, white, and yellow. The following values, to specify full-on as red-as-red-can-be, all produce the same result:
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