HTML5 has very good features compared to 4, how ever support for various features are limited from different browsers, is it too early to move to HTML5 as it requires many tricks to be backward compatible with lower version browsers?
With respect to CSS3 as well the support is not full fledged and in order to backward compatible we have to do lot of work arounds. Is it possible to have a list of features that are widely supported by browser for html5 and CSS3.
On the topic of browser compatibility, I'd be curious to know what the options are in terms of mobile browser compatibility. Also if you know the mobile browser road maps for support that would be very helpful. It is probably a given, but the mobile platforms that I am most interested in are iOS and Android.