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<!DOCTYPE html> <html> <body> <h1>The Window Object</h1> <h2>The opener Property</h2> <p id="demo"> Click the button to open a new window that writes "HELLO!" in the opener window.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { const myWindow = window.open("", "", "width=300,height=300"); myWindow.opener.document.getElementById("demo").innerHTML = "HELLO!"; } </script> </body> </html>
