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[Constructor(double r, double g, double b, optional double a=1)] interface RGBAColor {

attribute double r;
attribute double g;
attribute double b;
attribute double a;

HSLAColor asHSL();
HexColor asHex();

static RGBAColor fromHSLA(double h, double s, double l, optional double a=1);
static RGBAColor fromHex(octet r, octet g, octet b, optional octet a=255);

stringifier DOMString (optional DOMString type="rgba");
static readonly attribute Map serializationTypes;

};

The stringifier looks up the type in the RGBAColor.serializationTypes Map; if it finds a function, it calls that with the RGBAColor as the sole argument and returns whatever the function returns. It's preloaded with UA-defined functions for “hex3”, “hex6”, “rgb”, “rgba”, “hsl”, and “hsla”.

Authors can define their own color formats by adding a fromFoo() to RGBAColor, a toFoo() to RGBAColor.prototype, and adding an appropriate serialization tag to RGBAColor.serializationTypes.

dictionary HSLAColor {

double h;
double s;
double l;
double a;

};

dictionary HexColor {

octet r;
octet g;
octet b;
octet a;

};

partial interface CSS {

CSSColor parseColor(DOMString color, optional Element el);

};

If parseColor is called with a color that depends on the element on which it is used, such as currentcolor or inherit, but no el argument was passed, throw a XXX error.