NS_IF_RELEASE(content);
IsInitialContainingBlock(nsIFrame* aFrame){  nsIContent* content;  PRBool      result = PR_FALSE;  aFrame->GetContent(&content);  if (content) {    nsIContent* parentContent;    content->GetParent(parentContent);    if (!parentContent) {      // The containing block corresponds to the document element so it's      // the initial containing block      result = PR_TRUE;    }    NS_IF_RELEASE(parentContent);  }  NS_IF_RELEASE(content);  return result;}