Definition
CSS Typed OM Level 1 defines CSSRGB
[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
interface CSSRGB : CSSColorValue {
constructor(CSSColorRGBComp r, CSSColorRGBComp g, CSSColorRGBComp b, optional CSSColorPercent alpha = 1);
attribute CSSColorRGBComp r;
attribute CSSColorRGBComp g;
attribute CSSColorRGBComp b;
attribute CSSColorPercent alpha;
};