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<!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.w3ii.com/"; } } </script> </body> </html>