<!DOCTYPE html>
<html lang="en-US">
<body>
<p>Click to find window length</p>
<button onclick="myFunction()">Window Length</button>
<p id="point"></p>
<h2>Learn CSS</h2>
<iframe src="/css"></iframe>
<h2>Learn jQuery</h2>
<iframe src="/jquery"></iframe>
<script>
var x = document.getElementById("point");
function myFunction(){
x.innerHTML = window.length;
}
</script> </body>
</html>