any tool, ide or whatever to search files where there are elements of a class o id? I would insert the class or the id to the search engine.
Many text editors will do that.
I personally use notepad++ (windows) to search same text across multiple files.
You did not specify an operating system, so I can only recommend what I use.
Here is a tutorial on search/replace on multiple files for emacs.
Answered By – Oded