Are they currently using ajax? If not, what is used?

Question

AJAX

Are they currently using ajax? If not, what is used?

Answer 1

AJAX is the ideology of refreshing a page without completely reloading it.
XMLHTTPRequest and fetch are just methods to get the content to refresh the page.

Answer 2

For now, it’s impossible to refuse it at all: it’s a simple and easily implemented interaction with the backend without reloading the page.
In the lion's share of old and new sites - it continues to be fruitfully used by all developers.
Basically, for loading content when scrolling, banners, counters, etc.

Answer 3

What for? You can of course try the ancient method with a null iframe, but why? the technology is almost 15 years old and the implementation differs only in a set of chips.
https://caniuse.com/#search=XMLHTTPRequest