code: def _get_heading_level(self, element):
          
          # pylint: disable=no-self-use
  
          tag = element.get_tag_name()
          if tag == 'H1':
              return 1
          elif tag == 'H2':
              return 2
          elif tag == 'H3':
              return 3
          elif tag == 'H4':
              return 4
          elif tag == 'H5':
              return 5
          elif tag == 'H6':
              return 6
          return -1
docs: Returns the level of heading.
  
          :param element: The heading.
          :type element: hatemile.util.html.htmldomelement.HTMLDOMElement
          :return: The level of heading.
          :rtype: int