HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>namespace official demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    p { padding: 16px; background: #eef; border-radius: 8px; }
    button { padding: 10px 18px; cursor: pointer; margin-top: 12px; }
    #display { margin-top: 12px; font-weight: bold; color: #1e293b; }
  </style>
</head>
<body>
  <p id="target">Listener on this paragraph (test.something)</p>
  <button type="button" id="fire">Trigger test.something</button>
  <div id="display">Click the button to trigger.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#target").on("test.something", function (event) {
      $("#display").text("event.namespace = "" + event.namespace + """);
    });
    $("#fire").on("click", function () {
      $("#target").trigger("test.something");
    });
  </script>
</body>
</html>

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jQuery event.namespace — official demo (Try It)