Re: [w3ctag/design-reviews] CSS Color: lab(), lch() (#488)

@imkremen CAM16 is a [color appearance model](https://en.wikipedia.org/wiki/Color_appearance_model), not a color space.

> A color appearance model (CAM) is a mathematical model that seeks to describe the perceptual aspects of human color vision, i.e. viewing conditions under which the appearance of a color does not tally with the corresponding physical measurement of the stimulus source. (In contrast, a color model defines a coordinate space to describe colors, such as the RGB and CMYK color models.)

While CAMs result in more accurate color specification, they are not feasible for the Web platform, as we do not know the viewing conditions (and just setting them to defaults renders the whole point of using a CAM moot).

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