[css-typed-om] Spec up ColorValue

[shans]

[nainar]

@tabatkins

[shans]

This should probably be a different class for each of the broad color types, along with converters between the different classes.

[kenchris]

Maybe it should not be prefixed with CSS and it would probably make sense using the same across Web and Node.js and many APIs needs to deal with color. Maybe this could even go into JS proper at some point. @anssiko

[grorg]

I can't imagine that ES-whatever would accept a proposal for a Color type. I can't think of any other language that has that as a primitive (maybe PostScript?).

It's probably better to focus on just the CSS OM use case.

[nainar]

After discussing this with Tab the suggestion is to adopt the strategy here which adds different classes for all the different ways we can represent color, for example hsl, rgba, lab, etc in Typed OM 1.

In Typed OM 2 we can look at adding extensible functions/objects which was also part of this change.