How to find a list of similar sites by the text content of the code of any site?

Question

Google

For example, there are sites that are made on WP.
In the code in the Head tag there is such a phrase wp-content, is it possible to somehow form a search query using this phrase in such a way that it gives out all the sites that are made on WP or is this not a real task?)

Answer 1

if you search by engine - then one task
if by wp-content in Yandex - then another