Tryit Editor v2.7

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p>Click the button to display this window's height and width (NOT including toolbars and scrollbars).</p>

<button onclick="myFunction()">Try it</button>

<p><strong>Note:</strong> The innerWidth and innerHeight properties are not supported in IE8 and earlier.</p>

<p id="demo"></p>

<script>
function myFunction() {
    var w = window.innerWidth;
    var h = window.innerHeight;
    document.getElementById("demo").innerHTML = "Width: " + w + "<br>Height: " + h;
}
</script>

</body>
</html>