code: def render(self, text, **overrides):
          
          options = self.defaults
          if overrides:
              options = copy(options)
              options.update(overrides)
          return markdown(text, self.renderer, **options)
docs: It delegates to the :func:`markdown` function, passing any default
          options or renderer set in the :meth:`__init__` method.
  
          The ``markdown`` template filter calls this method.
  
          :param text: Markdown-formatted text to be rendered to HTML
          :param overrides: Additional options which may override the defaults
          :return: A :class:`flask.Markup` instance representing the rendered text