What tool to use to search for css selectors in source code?

Question

css

There are extensions for Chrome (CSS and XPath checker, CSSViewer) that show the css selector for the selected element on the page. You need the same tool, but to view the source code (the above extensions do not work with the source code). To just poke with the cursor and he brought out the css path for the given element. What do you advise?
UPD:
The source code appears in the browser when you press the keyboard shortcut Ctrl + U (Chrome).

Answer 1

ctrl+f