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<script>
function start() {
o1=document.createElement('iframe');
o1.addEventListener('load',fun0);
document.body.appendChild(o1);
}
function fun0() {
o5=o1.contentDocument;
o52=function() {let x=o5.querySelectorAll('*:not([id])');return x[x.length-1]}();
o1.contentWindow.onresize=fun1;
o1.height='5px';
o52.clientTop;
}
function fun1() {
document.documentElement.appendChild(o1);
}
</script>
<body onload="start()"></body>