code: def get_header(self, elem, style, node):
          
          font_size = style
          if hasattr(elem, 'possible_header'):
              if elem.possible_header:
                  return 'h1'
  
          if not style:
              return 'h6'
  
          if hasattr(style, 'style_id'):
              font_size = _get_font_size(self.doc, style)
  
          try:
              if font_size in self.doc.possible_headers_style:
                  return 'h{}'.format(self.doc.possible_headers_style.index(font_size)+1)
  
              return 'h{}'.format(self.doc.possible_headers.index(font_size)+1)
          except ValueError:
              return 'h6'
docs: Returns HTML tag representing specific header for this element.
  
          :Returns:
            String representation of HTML tag.