<!DOCTYPE html>
<html lang="en-US">
<body onresize="myFunction()">
<p>Resize the output window using resize handling bar between editor and output window.</p>
<p>InnerWidth: <span id="point"></span></p>
<script>
var x = document.getElementById("point");
function myFunction(){
x.innerHTML = window.innerWidth;
}
</script> </body>
</html>