How not to load page content without entering a password?

Question

Passwords

The bottom line is this:
On some sites there is a hard blocking of content if AdBlock is enabled, namely, instead of content in the middle of the monitor, “turn off the blocker” is lit. At the same time, even when checking the source code of the page through Ctrl + Shift + I (Chrome), there is no hint of the content indexed by the search engine.
Question: how to do the same, but with a password field? And if the password is not entered when opening the page in the browser, the content was not loaded at all.

Answer 1

Found a universal solution for any site https://elims.org.ua/blog/php-zashhita-stranicy-pa...