Windows Phone 7.1 has internet browser, which is almost the same version used for IE9 desktop edition. This means the WP7+ is able to render HTML5 content. Usually Widows Phone is executing the HTML5 application which is hosted on some web server, and it is not a big deal to open it in online mode. If you like to open HTML App in offline mode you will have a little problem. Currently there is no way for WebBrowserControl in WP 7.1 mango to navigate to HTML file which is located somewhere in file system at the phone as this is supported by Android and iOS. This means you are constrains to develop clasic HTML5 Widget app on WP7. This presentation will try to show how to make HTML5 WP7.1 widget app by using WPWidgetLibrary – open source prject developed just to make HTML Wigdet as native WP7 app with ability to update and even publish HTML app on the WP7 marketplace. Presentation will also show how to use HTML5 tags like location and canvas in WP7, as well as how to incorporate jQuery and jQueryMobile as one of today the most popular tools for creating cross-platform mobile and tablet applications.