The bootstrap is returning the expected responses afaict, but [is_displayed()](https://github.com/SeleniumHQ/selenium/blob/master/py/selenium/webdriver/remote/webelement.py#L170), [is_enabled()](https://github.com/SeleniumHQ/selenium/blob/master/py/selenium/webdriver/remote/webelement.py#L86), [is_selected()](https://github.com/SeleniumHQ/selenium/blob/master/py/selenium/webdriver/remote/webelement.py#L82)  are handled differently from [get_attribute()](https://github.com/SeleniumHQ/selenium/blob/master/py/selenium/webdriver/remote/webelement.py#L69) on the selenium side.