How to search within the content of an HTML page?

Question

Google

Hello!
Tell me, is there a way to search for a piece of code inside HTML pages on all sites through Google (or some other search engine)?
Previously, it seems that there was such an opportunity through the inhtml:bla-bla-bla keyword.
But now, in my opinion, this does not work or I'm doing something wrong.
Well, for example, I want to find all sites that have Google Analytics or Yandex metrics embedded in them. That is, you need to look for sites where the page has "/mc.yandex.ru/metrika/watch.js"

Answer 1

https://nerdydata.com/