Yesterday while in the train to Amsterdam, I was reading my Stephen Covey book—no! this post is about something else. Sorry. You see it is about the use of special characters on the web.
Smart‐ass Peter K. Sheerin illustrates important typesetting rules for correct (web)publishing. I can see that although the results are visual nuances, it does facilitate reading online texts.
Read The trouble with EM and EN on A list apart.