for their Web site or app Improved universal control designs WinJS 4.0 A preview of WinJS 4.0 was announced on March 27, 2015, and the full release was announced on June 8. See also HTML5 JavaScript JScript React Native, alternative JavaScript library for UWP application development Windows 8 Windows Runtime JavaScript library JavaScript framework References External links Developing Windows Store apps (HTML) WinJS Namespace WinJS Playground WinJS project on GitHub JavaScript libraries Microsoft application programming interfaces Microsoft free software Software using the Apache license Windows 8 Windows Phone Windows technology 2012 software