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Sep 17, 2011 09:18 AM|LINK
this is what shows in the documentation:
Page Inspector is a tool that renders a web page (HTML, Web Forms, ASP.NET MVC, or Web Pages) directly within the Visual Studio IDE and lets you examine both the source code and the resulting output. For ASP.NET pages, Page Inspector lets you determine which
server-side code has produced the HTML markup that is rendered to the browser.
To use Page Inspector, you must have the following:
Visual Studio 11 Developer Preview installed on your computer.
.NET Framework 4.5 Developer Preview installed on your computer.
A Web application that targets the .NET Framework 4 or later.
That last sentence makes me believe it's for any web application so including webforms.