"The theme enables HTML5 pages to adapt automatically to the Metro design style when rendered on Windows Phone 7.5. The Metro style theme is open source and available for download here.
Sergei Grebnov has worked closely with the Windows Phone division to support the new Metro style theme's development. He is an Apache Cordova committer and JQuery Mobile developer.
- Apache Cordova: Microsoft sponsored the development of full Windows Phone support for PhoneGap which is now Apache Cordova.
- JQuery Mobile: They added support to JQuery Mobile in order for it work well with the Windows Phone platform.
Another note... The metro style theme for JQuery Mobile can be used as a Nuget Package in Visual Studio as well. For further reading and more information on the Metro UI theme for JQuery Mobile, visit the project homepage.