NS_IMETHOD GetElementsByTagName(const nsString& aTagname,
NS_IMETHOD GetElementsByTagName(const nsAReadableString& aTagname,
  NS_IMETHOD GetElementsByTagName(const nsString& aTagname,                                                  nsIDOMNodeList** aReturn) {                  return mInner.GetElementsByTagName(aTagname, aReturn);                       }                                                                        