rv = NS_CreateHTMLElement(getter_AddRefs(htmlContent), aNodeInfo);
rv = NS_CreateHTMLElement(getter_AddRefs(htmlContent), aNodeInfo, PR_FALSE);
nsHTMLElementFactory::CreateInstanceByTag(nsINodeInfo *aNodeInfo,                                          nsIContent** aResult){  NS_ENSURE_ARG_POINTER(aResult);  NS_ENSURE_ARG_POINTER(aNodeInfo);  nsresult rv;  nsCOMPtr<nsIHTMLContent> htmlContent;  rv = NS_CreateHTMLElement(getter_AddRefs(htmlContent), aNodeInfo);  nsCOMPtr<nsIContent> content = do_QueryInterface(htmlContent);  *aResult = content;  NS_IF_ADDREF(*aResult);  return rv;}