HTMLAttribute(nsIAtom* aAttribute, const nsHTMLValue& aValue)
HTMLAttribute(nsIAtom* aAttribute, const nsAReadableString& aValue)
  HTMLAttribute(nsIAtom* aAttribute, const nsHTMLValue& aValue)    : mAttribute(aAttribute),      mValue(aValue),      mNext(nsnull)  {    MOZ_COUNT_CTOR(HTMLAttribute);    NS_IF_ADDREF(mAttribute);  }