[css-typed-om] Is CSSKeywordish used anywhere?

[darrnshn]

The spec gives a definition of CSSKeywordish, but it doesn't seem to be used anywhere. Perhaps it was only used by the font stuff which later got removed? Should we still keep this?

[tabatkins]

It'll be useful as we add more things that care about keywords. We have relatively few CSSValue subclasses right now, and none of them take keywords yet, but there will be some in the future. (In particular, the color classes will use keywords.)