nsCOMPtr<nsIAtom> tag; aContent->GetTag(getter_AddRefs(tag)); return (tag == nsHTMLAtoms::td);
return (aContent->Tag() == nsHTMLAtoms::td && aContent->IsContentOfType(nsIContent::eHTML));
static PRBool IsCell(nsIContent *aContent){  nsCOMPtr<nsIAtom> tag;  aContent->GetTag(getter_AddRefs(tag));  return (tag == nsHTMLAtoms::td);}