code: def submit_form_action(self, url):
      
      form = ElementSelector(
          world.browser,
          str('//form[@action="%s"]' % url),
      )
      assert form, \
          "Cannot find a form with action '{}' on the page.".format(url)
      form.submit()
docs: Submit the form with the given action URL (i.e. the form that submits to
      ``/post/my/data``).