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<!DOCTYPE html> <html> <head> <script> function openWin() { var myWindow = window.open("", "", "width=400, height=200"); myWindow.opener.document.getElementById("demo").innerHTML = "A new window has been opened."; } </script> </head> <body> <button onclick="openWin()">Open myWindow</button> <p id="demo"></p> </body> </html>