HTML5 has held a ton of promise, and things are much better today than they were a few years ago. Using HTML5 for some web elements and apps is a good way to go, but can you afford to go all-in? It appears that Facebook is pulling back from HTML5, and there must be good reason to do so.
There is something to be said about the cross-platform, yeoman-like performance of HTML+JavaScript, and a good reason to build books for the greatest availability options, on all devices.
Facebook ditches HTML5
There is something to be said about the cross-platform, yeoman-like performance of HTML+JavaScript, and a good reason to build books for the greatest availability options, on all devices.