WinJS

WinJS is a library of CSS and JavaScript files. It contains JavaScript objects, organized into namespaces, designed to make developing Windows Store app using JavaScript easier. It includes objects that help you handle activation, access storage, and define your own classes and namespaces. It also includes a set of controls.

The Windows Library for JavaScript provides a set of new controls designed for Windows Store apps using JavaScript, such as the WinJS.UI.DatePicker, WinJS.UI.FlipView, WinjS.UI.ListView, and WinJS.UI.Rating controls. It also includes two style sheets (one with a dark color scheme and one with a light) that give your app the look and feel of Windows 8.

Changelog
1.0.9345.0.winmain_bluem1.130218-1736
 * Introduced a new Hub Control

1.0.9360.0.winmain.130311-1741
 * Introduced a new searchBox control