How can I ask emacs to show me (visually) invisible characters like CR LF?

Question

The title says it all: I want emacs to show (all, or only some, like CR LF) invisible characters in my buffer? (If it matters: I am using the latest emacs (25) on the latest debian testing)

(I am not used to the tags used on this site, so please help to make more useful tags)

Answer 1

Check out M-xwhitespace-mode and M-xcustomize-group RETwhitespace

By default it is set up to visually emphasise spaces, tabs, and line endings, but you can tune it to eg leave spaces alone.