One use case would be to create server-side 'widgets' just like Yesod does. The basic idea is that they combine the document, style and scripting in a single r

One use case would be to create server-side 'widgets' just like Yesod does. The basic idea is that they combine the document, style and scripting in a single reusable component. Pages are then built by composing these widgets together and can finally be used as templates when responding to requests.