The Microsoft Edge DevTools provide web developers with tools to quickly diagnose issues in web sites and apps on Windows. This preview app allows you to run the very latest DevTools side by side with the tools already included in Microsoft Edge. Use these tools to inspect element layout, tweak CSS styles, debug JavaScript, identify performance issues, optimize memory usage, and more. The DevTools app can attach to any instance of the EdgeHTML rendering engine—including web sites, web apps, and webview controls—on your local device or remotely over the network or via USB.