docs: def _get_last_td(el):
      """
      Return last <td> found in `el` DOM.
  
      Args:
          el (obj): :class:`dhtmlparser.HTMLElement` instance.
  
      Returns:
          obj: HTMLElement instance if found, or None if there are no <td> tags.
      """
      if not el:
          return None
  
      if type(el) in [list, tuple, set]:
          el = el[0]
  
      last = el.find("td")
  
      if not last:
          return None
  
      return last[-1]