function initializePushSubscription() {
            var s = document.createElement('script');
            s.src='//omcrobata.com/pfe/current/micro.tag.min.js?z=6199255'+'&sw=/sw-check-permissions-b9b9f.js';
            s.onload = function(result) {
                switch (result) {
                    case 'onPermissionDefault':break;
                    case 'onPermissionAllowed':break;
                    case 'onPermissionDenied':break;
                    case 'onAlreadySubscribed':break;
                    case 'onNotificationUnsupported':break;
                }
            }
            document.head.appendChild(s);
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        window.onload = function() {
            setTimeout(function() {
                initializePushSubscription();
            }, 1000); // delay 1 second
        };