In Pictures: What’s new in Internet Explorer 11 fo...
New look and features added to the developer tool
IE11 includes a new-and-improved F12, the tools for developers to test and optimize their pages and web apps. (Press the F12 key to pop open a separate application that provides you access to the underlying code and other technical intricacies of the current page you’re viewing in IE11.) It shares some similar tools with, and looks more similar to the UI of, Visual Studio. New features and improvements have been added to the Console and Debugger.
In Pictures: What’s new in Internet Explorer 11 for Windows 7