[css-color-5] color-mix() serialization should be updated to cover all interpolation methods

[weinig]

The specification for the serialization of color-mix(), https://drafts.csswg.org/css-color-5/#serial-color-mix, should be update to cover all the interpolation methods. This means adding:

• srgb-linear
• xyz-d50
• xyz-d65

[svgeesus]

Good catch, will do.

[weinig]

What is the rationale that color-mix(in srgb-linear ...) serializes to color(srgb ...) and not color(srgb-linear ...).

[svgeesus]

Oh gosh my brain is tired. Yes, of course 🤦