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<!DOCTYPE html> <html> <body> <p>Click the button to write some text in the new window and the source (parent) window.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var myWindow = window.open("", "myWindow", "width=200,height=100"); myWindow.document.write("<p>This is 'myWindow'</p>"); myWindow.opener.document.write("<p>This is the source window!</p>"); } </script> </body> </html>