Display ads can have subframes that contain the actual creative content. The sub-frame’s domain may differ from the main frame’s domain. DSPs intend to use reserved.top_navigation automatic beacons to record navigation clicks with the current FLEDGE API. However, when clicks occur within sub-frames that are cross origin to the main frame, these automatic beacons will not be sent out. A cross-origin subframe can now opt in to sending automatic beacons by setting a new response header: "Allow-Fenced-Frame-Automatic-Beacons". The cross-origin frame still cannot set automatic beacon data; instead, the main ad frame will set the automatic beacon data, but opt in to having the data be used in cross-origin frames using a new "crossOrigin=true" parameter. When these two criteria are met, the cross-origin subframe will send an automatic beacon when a top-level navigation happens.