HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>slideUp default duration</title>

  <style>

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

    button { padding: 8px 14px; margin-bottom: 12px; }

    #panel { padding: 14px; background: #fef3c7; border: 1px solid #d97706; border-radius: 8px; }

    p { color: #64748b; font-size: 14px; }

  </style>

</head>

<body>

  <button type="button" id="dismiss-btn">Dismiss panel</button>

  <p>Default duration is 400 ms when omitted.</p>

  <div id="panel">This visible panel slides up and hides on dismiss.</div>

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

  <script>

    $("#dismiss-btn").on("click", function () {

      $("#panel").slideUp();

    });

  </script>

</body>

</html>

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jQuery .slideUp() — default 400ms (Try It)