How to search on the contents of the HTML page?

Tell me, is there a way to search a piece of code within the HTML pages for all sites using Google (or any other search engine)?
Before, it seems, was the opportunity through keyword inhtml:bla-bla-bla
But now it is, in my opinion, is not working or I am doing something wrong.
Well, for example, want to find all the sites in the expansions that are embedded metric in Google Analytics or Yandex-metric. That is, you need to look for websites where on the page is "/"
March 23rd 20 at 19:29
1 answer
March 23rd 20 at 19:31
charge :( - Elsa77 commented on March 23rd 20 at 19:34
@Elsa77, of course, it's pretty niche) - Zoe_Wilderman commented on March 23rd 20 at 19:37

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