What extensions to HTML5 and/or Javascript are available for use by Android web apps?

[Daniel Trebbien]

I know that PhoneGap extends the Javascript runtime to allow the web app to access native functionality. But, are there extensions to HTML5 and/or Javascript that are available to Android web apps by default (i.e. without using PhoneGap or a similar library)?

[Sebastien Blanc]

By default, you can access your geolocation data and detect the orientation of your phone. Accessing the camera orcontacts, as you said, is only possible by using a tool such as Phonegap. But HTML5 provides also some nice features to compete with native apps like : offline caching/local storage