{ return nsGenericContainerElement::IsSupported(aFeature, aVersion, aReturn); }
{ return nsGenericElement::IsSupported(aFeature, aVersion, aReturn); }
  NS_IMETHOD    IsSupported(const nsAString& aFeature,                            const nsAString& aVersion,                            PRBool* aReturn)  { return nsGenericContainerElement::IsSupported(aFeature, aVersion,                                                  aReturn); }