An amazing video (again) from @heydonworks about what progressive enhancement is, and what it is not. A defy you to not giggle during the video and to not come away with a better way of explaining PE.
Progressive enhancement is Scary Mary™ to some but there is no need to cry or pass out. Let me use a shark in a fez, Tony Hawk, and a couple of zombie lads to explain. Shout out to my pal Andy whose skateboard/scooter analogy I borrowed. Also, check outAn excerpt from Is Progressive Enhancement Dead Yet? (Webbed Briefs)