Progressive enhancement is saddening. Don’t use it.
I’ve always been a proponent of progressive enhancement. I promoted it with clients when I still had those, and I teach it to my students now that I’m a lecturer. But this will have to change. Heydon Pickering, a true master in using valid arguments, wrote this very convincing article called Progressive Enhancement Makes Me Sad. Here’s one final reason not to use it: We do not want sad Heydons.