code: def start_tag(self):
          '''Returns the elements HTML start tag'''
          direct_attributes = (attribute.render(self) for attribute in self.render_attributes)
          attributes = ()
          if hasattr(self, '_attributes'):
              attributes = ('{0}="{1}"'.format(key, value)
                                               for key, value in self.attributes.items() if value)
  
          rendered_attributes = " ".join(filter(bool, chain(direct_attributes, attributes)))
          return '<{0}{1}{2}{3}>'.format(self.tag, ' ' if rendered_attributes else '',
                                         rendered_attributes, ' /' if self.tag_self_closes else ""f start_tag(self):
          '''Returns the elements HTML start tag'''
          direct_attributes = (attribute.render(self) for attribute in self.render_attributes)
          attributes = ()
          if hasattr(self, '_attributes'):
              attributes = ('{0}="{1}"'.format(key, value)
                                               for key, value in self.attributes.items() if value)
  
          rendered_attributes = " ".join(filter(bool, chain(direct_attributes, attributes)))
          return '<{0}{1}{2}{3}>'.format(self.tag, ' ' if rendered_attributes else '',
                                         rendered_attributes, ' /' if self.tag_self_closes else "")
docs: Returns the elements HTML start tag