YES

<!DOCTYPE html>
<html>
<body>

<div id="divy">
<iframe width='600' height='800' id='cat' src='mylog.log'></iframe>
</div>

<script>
    iframe = document.getElementById('cat');


iframe.onload = function () { iframe.contentWindow.scrollTo(0,iframe.contentWindow.document.body.scrollHeight); };


window.onload = function () { console.log(iframe.contentWindow.document.body.scrollHeight) };

 //window.scrollTo(0,document.body.scrollHeight)
    //setInterval(function(){  document.getElementById("divy").innerHTML="<iframe src='test.html'></iframe>"; }, 3000);

</script>
<body>
</html>