PassRefPtrWillBeRawPtr<HTMLElement> HTMLTableElement::createTHead()
{
    if (HTMLTableSectionElement* existingHead = tHead())
        return existingHead;
    RefPtrWillBeRawPtr<HTMLTableSectionElement> head = HTMLTableSectionElement::create(theadTag, document());
    setTHead(head, IGNORE_EXCEPTION);
    return head.release();
}
HTMLTableSectionElement* HTMLTableElement::createTHead() {
  if (HTMLTableSectionElement* existingHead = tHead())
    return existingHead;
  HTMLTableSectionElement* head =
      HTMLTableSectionElement::create(theadTag, document());
  setTHead(head, IGNORE_EXCEPTION);
  return head;
}