nsCOMPtr<nsIDOMCSSValue> val;  aReturn.Truncate();  nsresult rv = GetPropertyCSSValue(aPropertyName, getter_AddRefs(val)); NS_ENSURE_SUCCESS(rv, rv);  if (val) { rv = val->GetCssText(aReturn); }  return rv;
return GetPropertyValue( NS_ConvertASCIItoUTF16(nsCSSProps::GetStringValue(aPropID)), aValue);
nsComputedDOMStyle::GetPropertyValue(const nsAReadableString& aPropertyName,                                     nsAWritableString& aReturn){  nsCOMPtr<nsIDOMCSSValue> val;  aReturn.Truncate();  nsresult rv = GetPropertyCSSValue(aPropertyName, getter_AddRefs(val));  NS_ENSURE_SUCCESS(rv, rv);  if (val) {    rv = val->GetCssText(aReturn);  }  return rv;}