What is meant iOS 4.2 for Webdeveloper?
1) iOS 4 html5test score was 186 and iOS 4.2 now clocks 196
2) Introduction of Websocket

a. Single most compelling API from html5 spec
b. Going to disrupt not only web push based applications like live chat/im/twitter/facebook/web mail but applications
can utilize low bandwidth bidirectional nature of application

3) What is missing?

a. Device notification API:
Web app should be able to notify even if user comes out of the browser and doing something else
b. Webm
Apple is paying royalties for H.264 but nothing stopping them utilizing webm for video and audio at least for
egalitarian purpose (can we expect?)
c. File access (at least photos and video taken by iDevices) as other native app does
d. Unlock the contract completed devices