web debugging

I am new to working with a C#.asp.net web forms applications. I have expereince stepping through code in C#.net 2008 desktop application. Thus I would like to be able to step through all the code in this application. Thus far I have been able to step through code in aspx.cs and aspx files

However, would like to know how to step through code in .js, html, css, and other types of files. If this is not possible, can you tell me or point me to references (urls) that will tell me how to debug these other types of files?

For .js, add the debugger keyword where you want the break point and enable debugging JS in IE -> Internet options -> Advance tab

Thanks!