https://www.saigatours.com/static/js/visibility/visibility.fallback.d515ac49e073.js

1// Add Page Visibility API support to old browsers by focus/blur hack.
2//
3// Include this script _before_ Visibility.js.
4//
5// Note, that this hack doesn’t correctly emulate Page Visibility API:
6// when user change focus from browser to another window (browser and your
7// page may stay visible), this hack will decide, that you page is hidden.
8//
9// For Firefox 5–9 it will be better to use MozVisibility hack without
10// this issue. See <https://github.com/private-face/mozvisibility>.
11;(function (document) {
12    if (document.visibilityState || document.webkitVisibilityState) {
13        return;
14    }
15
16    document.hidden = false;
17    document.visibilityState = 'visible';
18
19    var event = null
20    var i = 0
21    var fireEvent = function () {
22        if (document.createEvent) {
23            if (!event) {
24                event = document.createEvent('HTMLEvents');
25                event.initEvent('visibilitychange', true, true);
26            }
27            document.dispatchEvent(event);
28        } else {
29            if (typeof (Visibility) == 'object') {
30                Visibility._change.call(Visibility, {});
31            }
32        }
33    }
34
35    var onFocus = function () {
36        document.hidden = false;
37        document.visibilityState = 'visible';
38        fireEvent();
39    };
40    var onBlur = function () {
41        document.hidden = true;
42        document.visibilityState = 'hidden';
43        fireEvent();
44    }
45
46    if (document.addEventListener) {
47        window.addEventListener('focus', onFocus, true);
48        window.addEventListener('blur', onBlur, true);
49    } else {
50        document.attachEvent('onfocusin', onFocus);
51        document.attachEvent('onfocusout', onBlur);
52    }
53})(document);