RGBColor getRGBColorValue( ) throws DOMException;
The RGBColor object that represents the value of this CSSPrimitiveValue.
This method throws a DOMException with a code of INVALID_ACCESS_ERR if the primitiveType property is not CSS_RGBCOLOR.
This method returns an RGBColor object that represents a color. There is no corresponding setRGBColorValue( ) method, but you can modify the value by setting the properties of the returned RGBColor object.