And how is HTML any better?

This is a good example : http://fb.html5isready.com/ a fairly sophisticated facebook application in HTML. It's barely usable on my Lumia 920 (IE10), barely usable on my BlackBerry Z10 (webkit based browser) and doesn't even render properly on a Nexus 7 2012 (Firefox). All these are pretty powerful devices.

Doesn't look like HTML is working everywhere as people claim.