HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>slideDown default duration</title>

  <style>

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

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

    #panel { display: none; padding: 14px; background: #ecfdf5; border: 1px solid #10b981; border-radius: 8px; }

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

  </style>

</head>

<body>

  <button type="button" id="panel-btn">Show panel</button>

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

  <div id="panel">This hidden panel slides down with the default timing.</div>

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

  <script>

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

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

    });

  </script>

</body>

</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

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