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<!DOCTYPE html> <html> <head> <script> var myWindow; function openWin() { myWindow = window.open("", "", "width=400 ,height=200"); } function closeWin() { if (myWindow) { myWindow.close(); } } function checkWin() { msg = "" if (!myWindow) { msg = "was never opened"; } else { if (myWindow.closed) { msg = "is closed"; } else { msg = "is open"; } } document.getElementById("msg").innerHTML = "myWindow " + msg; } </script> </head> <body> <button onclick="openWin()">Open myWindow</button> <button onclick="closeWin()">Close myWindow</button> <button onclick="checkWin()">Is myWindow open?</button> <br><br> <div id="msg"></div> </body> </html>