[css-properties-values-api] Canonical units for computed values

[andruud]

The spec currently says:

For <custom-ident>, ident, <color>, <integer>, <angle>, <time>, <resolution> or "*" values, the computed value is as specified.

I think that's a little weird that e.g. 100ms becomes 0.1s for transition-duration, but for some reason stays 100ms for <time>-registered custom properties. (And similarly for the other types). I suggest:

• For <angle>, <time>, <resolution>: let the computed value be the specified value converted to its canonical unit, with calc resolved.
• For <integer>: resolve calc (i.e. same as <number>, <percentage>).
• For <color>: behave like color property? (Not sure about this one).

[tabatkins]

Agree.