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<!DOCTYPE html> <html> <body> <h1>The Window Object</h1> <h2>The closed Property</h2> <p><button onclick="openWin()">Open "myWindow"</button></p> <p><button onclick="closeWin()">Close "myWindow"</button></p> <p><button onclick="checkWin()">Is "myWindow" closed?</button></p> <div id="demo"></div> <script> let myWindow; function openWin() { myWindow = window.open("", "myWindow", "width=400,height=200"); } function closeWin() { if (myWindow) { myWindow.close(); } } function checkWin() { let text = ""; if (!myWindow) { text = "It has never been opened!"; } else { if (myWindow.closed) { text = "It is closed."; } else { text = "It is open."; } } document.getElementById("demo").innerHTML = text; } </script> </body> </html>
