   "dragEnd event, getNodeAt returns: " +
                        this.getNodeAt(params.pointer.DOM),
                );
            });
            network.on("controlNodeDragging", function (params) {
                params.event = "[original event]";
                document.getElementById("eventSpanHeading").innerText =
                    "control node dragging event:";
                document.getElementById("eventSpanContent").innerText = JSON.stringify(
                    params,
                  