Which Php Or cURL Php Function Auto Scrolls Page ?

Folks,

Look at this youtube serp:
https://www.youtube.com/results?search_query=make+money+online+in+2022
You are shown 10 search results.
Now, if you want to see more results, you got to scroll to the bottom of the page and only then more search results would be presented. Otherwise not.

Q1.
My question is, what php function or javascript function youtube is using here to feed you new search results like this ?

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