Disclosed are various embodiments for generating and/or processing a preview bundle. Embodiments include receiving a request from a client to generate a preview network page that corresponds to a production network page generated in a production environment. Embodiments further include specifying at least a portion of the preview network page as a user developed portion. Embodiments also include generating the preview network page that is based at least upon the production network page and by replacing source elements of the production network page associated with the user developed portion with at least one data structure element that contains the data elements referenced by the source elements of the corresponding production network page.