SafariDriver cannot handle alert displays after driver.get(url)

[Thanh hoang ngoc]

After I navigate to a page that has authentication, the login alert displays. Therefore, I handle it as the below way (It works on Firefox, but not work on Safari)

browser = webdriver.Firefox()
browser.get("url")
browser.find_the_element_by_id("add_button").click()
WebDriverWait(browser, 3).until(EC.alert_is_present(),
                                   'Timed out waiting for PA creation ' +
                                   'confirmation popup to appear.')
alert = browser.switch_to.alert

alert.send_keys("username" + Keys.TAB + "password")

alert.accept()

Please help me!

[David]

Which version of Safari and which version of Selenium?

[Thanh hoang ngoc]

Hi David, I'm using Safari 11.1 and selenium 3.12, language Python