interface SVGLength {
    const unsigned short SVG_LENGTHTYPE_UNKNOWN = 0;
    const unsigned short SVG_LENGTHTYPE_NUMBER = 1;
    const unsigned short SVG_LENGTHTYPE_PERCENTAGE = 2;
    const unsigned short SVG_LENGTHTYPE_EMS = 3;
    const unsigned short SVG_LENGTHTYPE_EXS = 4;
    const unsigned short SVG_LENGTHTYPE_PX = 5;
    const unsigned short SVG_LENGTHTYPE_CM = 6;
    const unsigned short SVG_LENGTHTYPE_MM = 7;
    const unsigned short SVG_LENGTHTYPE_IN = 8;
    const unsigned short SVG_LENGTHTYPE_PT = 9;
    const unsigned short SVG_LENGTHTYPE_PC = 10;

    readonly attribute unsigned short unitType;

    // FIXME: Support setraises().
    attribute float value; // setraises(DOMException);

    // attribute float valueInSpecifiedUnits setraises(DOMException);
    // attribute DOMString valueAsString setraises(DOMException);

    // void newValueSpecifiedUnits(in unsigned short unitType, in float valueInSpecifiedUnits) raises(DOMException);
    // void convertToSpecifiedUnits(in unsigned short unitType) raises(DOMException);
};