"Allowing an arbitrary website to work on a phone isn't really a fad, though." Agreed, but current implementation is mostly terrible, with 6 break points, 1-2M

"Allowing an arbitrary website to work on a phone isn't really a fad, though." Agreed, but current implementation is mostly terrible, with 6 break points, 1-2MB downloads, everything = single page app, etc. So the concept of write-once, run everywhere is not a fad, but the implementation is very fad-driven.