HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>readyException — default</title>
  <style>body{font-family:sans-serif;padding:16px} #log{background:#fef2f2;border:1px solid #fecaca;padding:12px;border-radius:8px;white-space:pre-wrap}</style>
</head>
<body>
  <div id="log">Waiting for ready…</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var original = jQuery.readyException;
    jQuery.readyException = function (error) {
      $("#log").text("readyException called:\n" + error);
      // Keep default-style visibility
      setTimeout(function () { throw error; }, 0);
    };
    $(function () {
      throw new Error("Ready handler failed");
    });
  </script>
</body>
</html>

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jQuery.readyException() — default throw (Try It)