https://api.drupal.org/api/drupal/core%21modules%21user%21src%21Form%21UserLoginForm.php/class/UserLoginForm/8.9.x
class UserLoginForm | Drupal API
classdrupalapi
https://www.mediawiki.org/wiki/Manual:Hooks/UserLoginForm
Manual:Hooks/UserLoginForm - MediaWiki
manual hooksmediawiki
https://api.drupal.org/api/drupal/core%21modules%21user%21src%21Form%21UserLoginForm.php/function/UserLoginForm%3A%3AvalidateFinal/9
function UserLoginForm::validateFinal | Drupal API
functiondrupalapi