How to pass a scroll in a request?

Question

Web development

Hello!
There is a page in which there is a scroll in the block and when scrolling, new material is loaded.
To automatically scroll in the browser (in the console), I just did this:
popup.scrollTop(popup[0].scrollHeight);
Please tell me in which direction to look, what library or what method is there so that it can be transferred not through the browser console, but for example through php or nodejs.
For example, I make a request on the server to the page "www.my.com", then I pass the command popup.scrollTop(popup[0].scrollHeight); and get content.
Thank you.

Answer 1

Probably, when scrolling to some point, an event occurs, having processed which JS makes an HTTP request, in response to which the content comes. You need exactly this request, the network tab to help.