def back(self) -> None:
        """The browser will navigate to the previous URL in the history.

        If there is no previous URL, this method does nothing.
        """
        raise NotImplementedError(
            "%s doesn't support moving back in history." % self.driver_name,
        )
The browser will navigate to the previous URL in the history.

        If there is no previous URL, this method does nothing.
        
splinter/driver/__init__.py