def assert_element_not_visible(self, selector, by=By.CSS_SELECTOR,<EOL>timeout=settings.SMALL_TIMEOUT):
if self.timeout_multiplier and timeout == settings.SMALL_TIMEOUT:<EOL><INDENT>timeout = self.__get_new_timeout(timeout)<EOL><DEDENT>self.wait_for_element_not_visible(selector, by=by, timeout=timeout)<EOL>return True<EOL>
Similar to wait_for_element_not_visible() - returns nothing.
            As above, will raise an exception if the element stays visible.
            Returns True if successful. Default timeout = SMALL_TIMEOUT.