I would say that the jist of it is that you shouldn't drastically modify the source DOM between runmodes. This is because your Authors are editing contextually, and tend to rely on the idea that what they see rendered in Author can be assumed to appear and behave as it would for users on the Publish...

One big advantage of performing this type of operation on the client side is that it's easier to support variables that might contain content that is dynamic (e.g. available products, geolocation, current date & time, or some specific value about the browser).This could certainly be done on the serv...