HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>fadeToggle stop guard</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    #msg {
      display: none;
      padding: 16px;
      background: #dcfce7;
      border: 2px solid #16a34a;
      border-radius: 8px;
      margin-top: 12px;
    }
    button { padding: 8px 16px; }
    #status { margin-top: 12px; color: #64748b; font-size: 14px; }
  </style>
</head>
<body>
  <button type="button" id="spam">Spam toggle (with stop guard)</button>
  <div id="msg">Toggle me — rapid clicks won't stack broken animations.</div>
  <p id="status">Click repeatedly; stop(true,true) clears the queue first.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#spam").on("click", function () {
      $("#msg").stop(true, true).fadeToggle(400);
    });
  </script>
</body>
</html>

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jQuery .fadeToggle() — rapid-click guard (Try It)