The Debug Page shows you the underlining XML, XSLT and XHTML of a page, and it’s extremely handy when you’re developing or debugging your XSLT. Every page has its unique Debug Page, and it can be accessed at /page-url?debug. (For example, if you have an “About” page at http://example.com/about, you can see its debug information at http://example.com/about/?debug.)