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

@dbaron : Thank you very much for your work.

Sorry for the delay in following up. I've been having a number of conversations about this topic in the past days.

The main value of functions like `lab()` and `lch()` would be to enable authors to express colors in CSS that are outside the sRGB gamut (but within the gamut of modern devices). A precondition is to have support in the browser for handling those richer colors: at the moment, Chromium uses a 32-bit ARGB format, so this would require introducing a higher-precision representation and supporting its use throughout the rendering pipeline.

As this looks like more than could be tackled by a one-volunteer effort, I'm stopping this implementation for now.

I am still very interested in this topic and would like to help in any way I can to move it forward; perhaps researching the concerns that @dbaron listed could be a first step.

I'm also wondering whether there could be other pieces of the Color spec that might be more easily implemented. For example, adding support for LAB interpolation (even if the colors may be clamped to the sRGB gamut for the time being).

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