Diagnosing Mobile Website Issues on Windows Phone 8.1 with Visual Studio

This post details how Visual Studio 2013 Update 2 enables debugging and performance tools for Internet Explorer on Windows Phone 8.1. It covers creating an ASP.NET project, launching it in the emulator or on a device, debugging websites without a Visual Studio project using the 'Debug Windows Phone Internet Explorer' option, and utilizing the Performance and Diagnostics hub for CPU Usage and HTML UI Responsiveness profiling. It highlights the DOM Explorer for layout debugging and the standard script debugger for JavaScript errors.