CalculatedStyle(CalculatedStyle parent, CascadedStyle matched) { this(); _parent = parent;  derive(matched); this._styleKey = genStyleKey();
protected CalculatedStyle() { _derivedValuesById = new FSDerivedValue[CSSName.countCSSPrimitiveNames()];
    CalculatedStyle(CalculatedStyle parent, CascadedStyle matched) {        this();        _parent = parent;        derive(matched);        this._styleKey = genStyleKey();    }