When you talk about web scraping, PHP is the last thing most people think about. This also means you can login to a website, submit a form, upload a file and whatnot all using this library siting at your server (or even on your local system) and still do all the things you would normally do.
Inside this tab you get to see the elements and their styling. This is very important to see the “name” attribute of the elements, to see if there are any hidden elements, find the form or its action attribute etc., you can use this “inspect” tool.
If we inspect the login form at https://gitlab.com/users/sign_in we see the following: It shows the name attribute of the email and password fields