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<!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>