Mobile devices are gaining popularity but the diversity of these devices poses a challenge for development. HTML 5 promises to bring a consistent API to program the client side for both desktop and diverse mobile devices. One additional challenge with mobile devices is network connectivity, or the lack of it. Mobile devices are often taken into remote areas with low or no connectivity. While a native app can run on the device anytime, a web based application by default depends on having connectivity, unless of course we use the offline capabilities of HTML 5. Come to this presentation to learn how to create applications that can switch seamlessly between connected and offline mode. Learn about offline options, configurations, local storage and how to program all of that, in this highly interactive, live coding session.