How to find out in greasemonkey that the DOM has changed?

Question

JavaScript

There is a page in which the content is loaded dynamically. I want to write a script that will change this content a little, but I can’t figure out how to find out that the DOM has changed.
I am somewhat far from the web, so such difficulties. jQuery is included in the script, maybe there is some kind of event in it?

Answer 1

Now there is MutationObserver . And when I was little and had to go to school two kilometers uphill on ice in winter, we simply checked for the presence of the necessary element / elements through a periodic setTimeout.