The relative color syntax allows existing colors to be modified using the color functions: if an origin color is specified, then each color channel can either be directly specified, or taken from the origin color (and possibly modified with math functions).
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The color-mix() functional notation takes two color values and returns the result of mixing them in a given colorspace by a given amount.
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The color-contrast() functional notation takes a color value and compares it to a list of other color values, selecting the one with the highest contrast from the list.
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The hwb() functional notation expresses a given color according to its hue, whiteness, and blackness. An optional alpha component represents the color's transparency.
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The lab() functional notation expresses a given color in the CIE L*a*b* color space. Lab represents the entire range of color that humans can see.
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The lch() functional notation expresses a given color in the LCH color space. It has the same L axis as lab(), but uses polar coordinates C (Chroma) and H (Hue).
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The oklch() functional notation expresses a given color in the OKLCH color space. It has the same L axis as oklab(), but uses polar coordinates C (Chroma) and H (Hue).
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The oklab() functional notation expresses a given color in the Oklab color space, which attempts to mimic how color is perceived by the human eye. The oklab() works with a Cartesian coordinate system on the OKlab color space, the a- and b-axes. If you want a polar color system, chroma and hue, use oklch().
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