Tryit Editor v2.9

Edit This Code:

<!DOCTYPE html>
<html>
<body>

<p>Click the button to find out if the window on the right side (the result side) is in an iframe. If so, change its URL to "w3schools.com".</p>

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

<script>
function myFunction() {
   var frame = window.frameElement;

   if (frame) {
   frame.src = "http://www.w3schools.com/";
   }
}
</script>

</body>
</html>

<!DOCTYPE html>
<html>
<body>

<p>Click the button to find out if the window on the right side (the result side) is in an iframe. If so, change its URL to "w3schools.com".</p>

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

<script>
function myFunction() {
    var frame = window.frameElement;
    
    if (frame) { 
        frame.src = "http://www.w3schools.com/";
    }
}
</script>

</body>
</html>