HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ajaxError + load() missing URL</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    .trigger { padding: 8px 14px; cursor: pointer; background: #dc2626; color: #fff; border: none; border-radius: 6px; }
    .result { margin-top: 12px; padding: 12px; background: #fef2f2; border-radius: 6px; min-height: 40px; }
    .log { margin-top: 12px; color: #b91c1c; font-size: 14px; }
  </style>
</head>
<body>
  <button type="button" class="trigger">Load missing page (404)</button>
  <div class="result">Result appears here on success only.</div>
  <div class="log">Click the button to trigger a failing .load().</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $(document).on("ajaxError", function() {
      $(".log").text("Triggered ajaxError handler.");
    });

    $(".trigger").on("click", function() {
      $(".result").load("https://httpbin.org/status/404");
    });
  </script>
</body>
</html>

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jQuery ajaxError — document handler + .load() to missing URL (Try It)