Page Inspector (Visual Studio)

Renders a preview of the HTML in your source.
Visually inspect how a page will render without having to leave Visual Studio.
You can use this feature to see a live version of the markup in real-time against your markup and code.

Inspector tool button
Any selections made are immediately synchronized in the Page Inspector itself, the HTML DOM and CSS definitions below, as well as your source HTML file, allowing you to trace elements and issues with the click of a button. Changes made to your source are then immediately reflected in the inspector, allowing you to fix errors on the fly without having to launch and refresh the application.