If relative color channels have calc() and that calc() contains a value with units, it was previously correctly considered invalid, but is now considered valid.

Examples:

• rgb(from rebeccapurple calc(r + 1%) g b)
• hsl(from rebeccapurple calc(h + 1deg) s l)

Tests:

• https://github.com/web-platform-tests/wpt/blob/master/css/css-color/parsing/color-invalid-relative-color.html