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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>readyException — console.error</title>
  <style>body{font-family:sans-serif;padding:16px} #log{background:#f1f5f9;padding:12px;border-radius:8px}</style>
</head>
<body>
  <div id="log">Open the browser console too — console.error will fire.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    jQuery.readyException = function (error) {
      console.error(error);
      $("#log").text("Logged via console.error: " + error.message);
    };
    $(function () {
      throw new Error("Logged via readyException");
    });
  </script>
</body>
</html>

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jQuery.readyException() — console.error (Try It)