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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>return false and flag</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #btn { padding: 10px 18px; background: #7c3aed; color: #fff; border: none; border-radius: 8px; cursor: pointer; }
    pre { margin-top: 12px; background: #1e293b; color: #e2e8f0; padding: 12px; border-radius: 6px; font-size: 13px; max-width: 32rem; white-space: pre-wrap; }
    p.note { font-size: 13px; color: #64748b; max-width: 32rem; }
  </style>
</head>
<body>
  <button type="button" id="btn">Click me</button>
  <pre id="log">Click the button.</pre>
  <p class="note">return false also calls stopPropagation(), so only the first handler runs.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#btn").on("click", function (event) {
      $("#log").text("before return false: " + event.isDefaultPrevented());
      return false;
    });
  </script>
</body>
</html>

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jQuery event.isDefaultPrevented() — return false (Try It)