A method includes, but is not limited to any combination of: determining a plurality of third-party content elements based in part on information associated with a request for third-party content. The request for third-party content may be received from a web browser displaying a first webpage to a user. A first element from the plurality of determined third-party content elements is transmitted to the web browser. Upon receiving from the web browser a second request for third-party content including user interaction data with the first element, data associated with the determined plurality of third-party content elements is updated based at least in part on the user interaction data. A second third-party element from the plurality of updated third-party content elements is transmitted to the web browser.