Backward compatibility in Sencha

As i am going to develop mobile web app for all devices. My question 开发者_开发知识库is, if the browser is not support html5 kind of stuff, Whether Sencha will support HTML4?

Thanks in advance,

srini

[sencha person] @Sri. Sencha Touch works on Android 2.1 and Apple iOS ONLY for release 1.0, and will be supporting RIM, Nokia etc. devices as they add modern browsers to their phones that can support javascript and CSS at reasonable performance and correctness.

[Update: We've tested the new RIM Blackberry Torch, and will be adding it to our support list - probably in release 1.1]

A majority of existing phones (Nokia featurephones etc.) are not capable of running a web application because they lack javascript performance, CSS support and even full HTML capabilities. In our (opinionated) view, the only phones (today) that can support a proper web app experience are Android 2.1+ and Apple iOS.

Well, I cannot give a definitive answer, but given that ExtJS (the name until recently) still supports Internet Explorer 6, I'd guess so. They are double-licensed as GPL + proprietary license, so cannot just drop support for something outdated since that would piss some/many paying customers.