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[Constructor(double r, double g, double b, optional double a=1), Constructor(RGBAColorInit color)] interface RGBAColor { attribute double r; attribute double g; attribute double b; attribute double a; HSLAColorInit asHSL(); static RGBAColor fromHSLA(double h, double s, double l, optional double a=1); static RGBAColor fromHSLA(optional HSLAColorInit color); HexColorInit asHex(); static RGBAColor fromHex(octet r, octet g, octet b, optional octet a=255); static RGBAColor fromHex(optional HexColorInit color); DOMString toString(optional DOMString type="rgba"); static readonly attribute Map serializationTypes; };
The toString() method 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 RGBAColorInit { double r = 0; double g = 0; double b = 0; double a = 1; }; dictionary HSLAColorInit { double h = 0; double s = 1; double l = .5; double a = 1; }; dictionary HexColorInit { octet r = 0; octet g = 0; octet b = 0; octet a = 255; }; 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.