if (typeof window === 'object') {

    (function () {

        let sayswho = (function () {
            var ua = navigator.userAgent, tem,
                M = ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [];
            if (/trident/i.test(M[1])) {
                tem = /\brv[ :]+(\d+)/g.exec(ua) || [];
                return 'IE ' + (tem[1] || '');
            }
            if (M[1] === 'Chrome') {
                tem = ua.match(/\b(OPR|Edge)\/(\d+)/);
                if (tem != null) return tem.slice(1).join(' ').replace('OPR', 'Opera');
            }
            M = M[2] ? [M[1], M[2]] : [navigator.appName, navigator.appVersion, '-?'];
            if ((tem = ua.match(/version\/(\d+)/i)) != null) M.splice(1, 1, tem[1]);
            return M.join(' ');
        })();


        let element = document.querySelector('h1')
        element.innerHTML += " " + sayswho;

    })();


}
