Login To A New Webpage

I ripped my current code from W3Schools just as a test. However, my question specifically is how can I make something like what is shown in the picture below as a login.

It has a required username and password (which I obviously won't give out for obvious reasons). I'm trying to create something like it.

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abc3354 (224)

@NEILEVANS It is not possible

You can do two prompts, or use this maybe

But actually these are cancellable and do not provide any real security

You can maybe use js to give access to a page after authentification

But keep in mind that all your pages will be available with the repl and the url