StyleDeclaration cs = (StyleDeclaration) elt.getComputedStyle();
IStyle cs = (IStyle) elt.getComputedStyle();
	public Value computeValue(CSSStylableElement elt, CSSEngine engine,			int idx, Value value) {		if (value.getCssValueType() == CSSValue.CSS_PRIMITIVE_VALUE) {			switch (value.getPrimitiveType()) {			case CSSPrimitiveValue.CSS_IDENT:				return value;			case CSSPrimitiveValue.CSS_PERCENTAGE:				float scale = value.getFloatValue();				StyleDeclaration cs = (StyleDeclaration) elt.getComputedStyle();				assert cs != null;				Value fontSize = (Value) cs.getProperty(IStyle.STYLE_FONT_SIZE);				assert fontSize != null;				float fs = fontSize.getFloatValue();				return new FloatValue(CSSPrimitiveValue.CSS_NUMBER, fs * scale);			}		}		return super.computeValue(elt, engine, idx, value);	}