if (sizeValue instanceof CSSValuePair == false)
{
// not a valid thing ..
return null;
}
CSSValuePair sizePair = (CSSValuePair) sizeValue;
final CSSValue firstValue = sizePair.getFirstValue();
final CSSValue secondValue = sizePair.getSecondValue();
final double width = convertLengthToDouble(firstValue, resolution);
final double height = convertLengthToDouble(secondValue, resolution);
if (width == 0 || height == 0)
{
return null;