W3C compliant testing

Test configuration changes

Drupal core now tests using selenium/standalone-chrome:latest via a W3C compliant webdriver.

To enable W3C mode in WebDriverTestBase tests (FunctionalJavascript) the MINK_DRIVER_ARGS_WEBDRIVER environment variable must pass "w3c": true in the options. For example:
["chrome", {"browserName":"chrome", "goog:chromeOptions":{"w3c":true, "args":["--no-sandbox","--ignore-certificate-errors", "--allow-insecure-localhost", "--headless", "--dns-prefetch-disable"]}}, "http://selenium:4444"]

To enable W3C mode in Nightwatch tests, the DRUPAL_TEST_WEBDRIVER_W3C environment variable must to be set to true. For example:
Add DRUPAL_TEST_WEBDRIVER_W3C=true to your .env file.

Non-W3C compliant testing is deprecated and will be removed in Drupal 12.

How to make your tests W3C webdriver compatible

1. Replace calls to ::moveTo() with ::mouseOver()
   

   Before

       $driver_session = $this->getSession()->getDriver()->getWebDriverSession();
       $element = $driver_session->element('css selector', '#block-branding');
       $driver_session->moveto(['element' => $element->getID()]);
   

   After

       $this->getSession()->getDriver()->mouseOver('.//*[@id="block-branding"]');
   

2. Replace calls to ::getAlert_text() with alert()->getText()
   

   Before

       $session->getDriver()->getWebDriverSession()->getAlert_text();
   

   After

       $session->getDriver()->getWebDriverSession()->alert()->getText();
   

3. Replace calls to ::accept_alert() with alert()->accept()
   

   Before

       $session->getDriver()->getWebDriverSession()->accept_alert();
   

   After

       $session->getDriver()->getWebDriverSession()->alert()-> accept();
   

4. If you used the method location() on a \WebDriver\Element instance only for getting the x and y position of a html element, replace calls to ::location() with ::rect()
   

   Before

       $session->getDriver()->getWebDriverSession()->element('xpath', $xpath)->location();
   

   After

       $session->getDriver()->getWebDriverSession()->element('xpath', $xpath)->rect();