Colors
RGB values specify a color via a Red, Green, Blue representation.
RGB Percentage is the same as RGB but uses percentages.
RGBA (RGB with Alpha channel [available in CSS 3]): The RGB palette is used with the addition of an alpha channel to specify transparency.
Hexadecimal: This enables you to specify a color by a special hexadecimal number.
Shorthand Hexadecimal: This is a shortened representation of hexadecimal numbers; it is limited to a special 216-color, web-safe palette.
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