crosoft.com/azure/cognitive-services/immersive-reader/reference#options
                        const options = {
                            "onExit": exitCallback,
                            "uiZIndex": 2000
                        };

                        ImmersiveReader.launchAsync(token, subdomain, data, options)
                            .catch(function (error) {
                                console.log(error);
                                alert("Error in launching the Immersive Reader. Ch