     type: "enable_webxr",
                        mode: "ar"  // Alternatively pass "vr" for VR only.
                    });
                },
                (i) => {
                    log_message("Restoring to perspective camera (this may lead to a " +
                        "squashed or stretched appearance, but that doesn't " +
                        "matter for this test). The button's text is updated. " +
                        "What the text is and whether it us enabled depends on " +
       