The Debug Devkit allows a developer to preview the XML of a Frontend page. It also includes the page parameters, included XSL templates and provides a navigation for other Devkit extensions (such as the Profile Devkit)
?debug to your front-end pages when logged in to initialise this Devkit. The Debug Devkit responds to the following URL's:
?debug=xml: Default view, shows a syntax highlighted XML tree of the front-end page with XPath support
?debug=raw: The raw XML of the current page
?debug=result: The result of the front-end page after it has been transformed with XSLT
?debug=params: The parameters of the current page, both from the system and from data sources.