The document discusses jQuery.pyproxy, a tool that allows modifying the DOM with Python by replacing KSS and using jQuery syntax. It works on both the client and server side by binding Ajax calls to events with pyproxy and pyproxy_call. On the Python side, the @jquery decorator defines views callable by jQuery.pyproxy while JQueryProxy modifies the DOM. Potential limitations and successful production use on Plone and Django are also mentioned.