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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>isWindow — reject</title>

</head>

<body>

  <pre id="out"></pre>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    (function () {

      document.getElementById("out").textContent = [

        "$.isWindow({}): " + $.isWindow({}),

        "$.isWindow(document): " + $.isWindow(document),

        "$.isWindow(document.body): " + $.isWindow(document.body),

        "$.isWindow(null): " + $.isWindow(null)

      ].join("\n");

    })();

  </script>

</body>

</html>

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jQuery.isWindow() — Not a Window (Try It)