'Similar to :meth:`execute_script <DriverAPI.execute_script>` method.
Executes javascript in the browser and returns the value of the expression.
e.g.: ::
>>> assert 4 == browser.evaluate_script(\'2 + 2\')'

def evaluate_script(self, script):

    raise NotImplementedError(("%s    doesn't    support    evaluation    of    arbitrary    JavaScript." % self.driver_name))
