Web pages may be dynamically generated in response to a web request from a client. The web request specifies a dynamic content resource that declares one or more server-side controls having personalizable properties. Personalization refers to the ability for server-side controls to save property values to persistent storage and is not necessarily limited to a user-specific data management. Personalization also refers to retrieving the property values from persistent storage when the server-side controls are instantiated in order to dynamically generate the web page reflecting the persistent personalization data. The personalized property values may also be output with the HTML data of the resulting page and sent to the client for display.