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<!DOCTYPE html> <html> <head> <script> function myFunction() { var myWindow = window.open("", "myWin"); myWindow.document.write("<p>This is 'myWin'"); myWindow.document.write("<br>ScreenLeft: " + myWindow.screenLeft); myWindow.document.write("<br>ScreenTop: " + myWindow.screenTop + "</p>"); } </script> </head> <body> <button onclick="myFunction()">Open "myWin"</button> </body> </html>