You have a few interesting points to take away from this exercise. First of all, you should understand the notion of dynamic files, or runtime files. These files are the final result from your ASPX pages and give you insight in the final HTML, CSS, and JavaScript that ends up in the browser. This is a great help, because it gives you a total view of all relevant content. Remember, the final markup displayed in the browser comes from a variety of resources, including master pages, content pages, external CSS and JavaScript files, and from the various server controls that live in your page. The ability to look at the combined result from a single location makes it easy to see how everything fits together.