Returns the element with focus, or BODY if nothing has focus.

        :Usage:
            ::

                element = driver.switch_to.active_element

def active_element(self):
        """
        Returns the element with focus, or BODY if nothing has focus.

        :Usage:
            ::

                element = driver.switch_to.active_element
        """
        if self._driver.w3c:
            return self._driver.execute(Command.W3C_GET_ACTIVE_ELEMENT)['value']
        else:
            return self._driver.execute(Command.GET_ACTIVE_ELEMENT)['value']