Looking for logging into the Javascript Alert site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Javascript Alert site. After that you can login as usual with your login credentials.
https://www.w3schools.com/js/js_popup.asp
https://www.formget.com/javascript-login-form/
https://www.tutorialspoint.com/javascript/javascript_dialog_boxes.htm
https://stackoverflow.com/questions/35937973/alert-login-popup-web-driver-script
https://teamtreehouse.com/community/how-to-display-alert-box-in-login-screen-in-php-if-a-user-enters-a-wrong-password-i-have-tried-that-in-ajax-is-there
https://www.daniweb.com/programming/web-development/code/330933/a-simple-html-login-page-using-javascript
http://www.javascriptkit.com/script/cut76.shtml
https://books.google.co.th/books?id=XEpvAgAAQBAJ&pg=PA406&lpg=PA406&dq=javascript+alert+login
https://sweetalert2.github.io/
https://www.enable-javascript.com/th/
https://books.google.co.th/books?id=7YdAAAAAQBAJ&pg=PA628&lpg=PA628&dq=javascript+alert+login
https://secure.mycreditalert.ca/
https://www.thaicreate.com/community/login-php-jquery-2encrypt.html