HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>stop before slideToggle</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }

    .block { background: #abc; border: 2px solid #333; width: 200px; height: 80px; margin: 10px 0; padding: 12px; border-radius: 6px; }

    button { padding: 8px 16px; }

  </style>

</head>

<body>

  <button type="button" id="toggle">slideToggle</button>

  <div class="block">Click toggle quickly — stop() prevents half-finished slides stacking.</div>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("#toggle").on("click", function () {

      $(".block").stop().slideToggle(1000);

    });

  </script>

</body>

</html>

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jQuery .stop() — slideToggle guard (Try It)