HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>close() — auto-close</title>
</head>
<body>
  <h1>close() auto-close</h1>
  <button type="button" id="openBtn">Open auto-close popup</button>
  <pre id="out">Waiting...</pre>
  <script>
    document.getElementById("openBtn").onclick = function () {
      var popup = window.open("", "AutoClose", "width=300,height=160");
      if (!popup) {
        document.getElementById("out").textContent = "Popup blocked.";
        return;
      }
      popup.document.write("<p>Closing in 2 seconds…</p>");
      popup.document.close();
      document.getElementById("out").textContent = "Popup opened. Waiting…";
      setTimeout(function () {
        if (popup && !popup.closed) {
          popup.close();
        }
        document.getElementById("out").textContent = "Popup auto-closed.";
      }, 2000);
    };
  </script>
</body>
</html>

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JavaScript Window close() — auto-close (Try It)