This document discusses the features and capabilities available to apps developed for the Windows 8 and Windows Phone 8 platforms using HTML5, JavaScript, and related technologies. It mentions technologies like Geo-location, Proximity, Direct3D, Direct2D, PlayTo, Bing, Azure, and more that can be accessed. It also lists platforms where apps can be deployed using frameworks like Cordova, PhoneGap, and others, including iOS, Android, Windows Phone, and Windows 8.