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<!DOCTYPE html> <html> <body> <p>Click the button to open a new window and close the window after three seconds (3000 milliseconds)</p> <button onclick="openWin()">Open "myWindow"</button> <script> function openWin() { var myWindow = window.open("", "myWindow", "width=200, height=100"); myWindow.document.write("<p>This is 'myWindow'</p>"); setTimeout(function(){ myWindow.close() }, 3000); } </script> </body> </html>