[webkit-dev] Colors

Hi, Looking Webkit color class(WebCore/platform/graphics/Color.*) all the colours format are always converted to rgb/rgba format. But Qt for example can handle many kind of colors like hsl, cmyk and rgba (all supported by webkit). is There any kind of reason to always convert colors to rgba? Theses converts could not be used just like a fallback when the graphics api does not have support for these formats? Igor