code: def submit_selected(self, btnName=None, update_state=True,
                          *args, **kwargs):
          
          self.get_current_form().choose_submit(btnName)
  
          referer = self.get_url()
          if referer is not None:
              if 'headers' in kwargs:
                  kwargs['headers']['Referer'] = referer
              else:
                  kwargs['headers'] = {'Referer': referer}
  
          resp = self.submit(self.__state.form, url=self.__state.url,
                             *args, **kwargs)
          if update_state:
              self.__state = _BrowserState(page=resp.soup, url=resp.url,
                                           request=resp.request)
          return resp
docs: Submit the form that was selected with :func:`select_form`.
  
          :return: Forwarded from :func:`Browser.submit`.
  
          If there are multiple submit input/button elements, passes ``btnName``
          to :func:`Form.choose_submit` on the current form to choose between
          them. If `update_state` is False, form will be submited but the browser
          state will remain unchanged. This is useful for forms that result in
          a download of a file. All other arguments are forwarded to
          :func:`Browser.submit`.