Tryit Editor v2.9

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

<p>Click the button to set the name of the window to "myWindowName".</p>

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

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

<script>
function myFunction() {
    window.name = "myWindowName";
    var x = "This window's name is now: " + window.name;
    document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>