The document defines functions for tracking visibility changes of web pages and elements. It defines a function called z that creates an object for tracking visibility events like page hiding/showing. This object defines properties like the element to track and callbacks for different events. It also defines functions for firing tracking pixels on those events.

1. (function(){var f=function(a){var b=typeof a;if("object"==b)if(a){if(a
instanceof Array)return"array";if(a instanceof Object)return b;var
c=Object.prototype.toString.call(a);if("[object
Window]"==c)return"object";if("[object Array]"==c||"number"==typeof
a.length&&"undefined"!=typeof a.splice&&"undefined"!=typeof
a.propertyIsEnumerable&&!
a.propertyIsEnumerable("splice"))return"array";if("[object
Function]"==c||"undefined"!=typeof a.call&&"undefined"!=typeof
a.propertyIsEnumerable&&!a.propertyIsEnumerable("call"))return"function"}else
return"null";else if("function"==b&&"undefined"==typeof
a.call)return"object";return b},g=Date.now||function(){return+new Date};var
h=document,k=window;var m=Array.prototype.indexOf?function(a,b){return
Array.prototype.indexOf.call(a,b,void 0)}:function(a,b){if("string"==typeof
a)return"string"==typeof b&&1==b.length?a.indexOf(b,0):-1;for(var
c=0;c<a.length;c++)if(c in a&&a[c]===b)return c;return-1};var n=function(a,b,c)
{a.addEventListener?a.addEventListener(b,c,void
0):a.attachEvent&&a.attachEvent("on"+b,c)},p=function(a,b,c)
{a.removeEventListener?a.removeEventListener(b,c,void
0):a.detachEvent&&a.detachEvent("on"+b,c)};var q=function(a){var b=!1,c=!
1;c=void 0===c?!1:c;b=void 0===b?!1:b;k.google_image_requests||
(k.google_image_requests=[]);var e=k.document.createElement("img");if(b){var
d=function(){if(b){var
a=k.google_image_requests,c=m(a,e);0<=c&&Array.prototype.splice.call(a,c,1)}p(e,
"load",d);p(e,"error",d)};n(e,"load",d);n(e,"error",d)}c&&(e.referrerPolicy="no-
referrer");e.src=a;k.google_image_requests.push(e)};var r=function(a,b,c)
{if("array"==f(b))for(var e=0;e<b.length;e++)r(a,String(b[e]),c);else null!
=b&&c.push(a+(""===b?"":"="+encodeURIComponent(String(b))))};var
y=function(a,b,c,e,d,l,t){u(h.hidden)?
(this.g="hidden",this.j="visibilitychange"):u(h.mozHidden)?
(this.g="mozHidden",this.j="mozvisibilitychange"):u(h.msHidden)?
(this.g="msHidden",this.j="msvisibilitychange"):u(h.webkitHidden)&&(this.g="webk
itHidden",this.j="webkitvisibilitychange");this.u=a;this.h=!1;this.i=-
1;this.A=b;this.B=c;this.o=e;this.s=d?"mousedown":"click";h[this.g]&&v(this,2);t
his.w=l;this.v=t||0;this.m=null;w(this);x(this)},w=function(a)
{n(h,a.j,function(){if(h[a.g])a.h&&(a.h=!1,a.i=g(),v(a,0));else{if(-1!=a.i){var
b=g()-a.i;b>a.v&&(a.i=-1,v(a,1,b))}v(a,3)}})},x=function(a){n(k,a.s,function(b)
{return a.l(b)})};y.prototype.l=function(a){var b=this;this.m=a.button;this.h=!
0;k.setTimeout(function(){b.h=!
1},5E3)};y.prototype.handleClick=y.prototype.l;var v=function(a,b,c){var e="//"+
(a.o?"googleads.g.doubleclick.net":"pagead2.googlesyndication.com")
+"/pagead/gen_204?",d={gqid:a.A,qqid:a.B};0==b&&(d["return"]=0);1==b&&(d["return
"]=1,d.timeDelta=c,a.w&&(d.cbtn=a.m));2==b&&(d.bgload=1);3==b&&(d.fg=1);b=[];for
(var l in
d)r(l,d[l],b);d=b.join("&");a=a.u+"&label=window_focus&"+d;q(e+"id=wfocus&"+d);q
(a)},u=function(a){return"undefined"!==typeof a};var z=function(a,b,c,e,d,l,t)
{return new y(a,b,c,e,d,l,t)},A=["wfocusnhinit"],B=this;A[0]in
B||"undefined"==typeof B.execScript||B.execScript("var "+A[0]);for(var
C;A.length&&(C=A.shift());){var D;if(D=!A.length)D=void 0!==z;D?
B[C]=z:B[C]&&B[C]!==Object.prototype[C]?B=B[C]:B=B[C]={}}var
E=k.google_wf_async,F;if(F=!(!E||!E.call))F="function"===typeof
E;F&&k.google_wf_async();}).call(this);