                 "whether your browser supports WebXR.", i)
                    viewer.create_camera();
                },
                (i) => {
                    log_message("Invoking 'enable_webxr' while already enabled; the " +
                                "console should display a warning about being " +
                                "'already enabled'.", i);
                    viewer.handle_command({
                        type: "enable_webxr",
                        mode: "vr"
           