HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>slideDown linear easing</title>

  <style>

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

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

    #drawer { display: none; padding: 16px; background: #fef3c7; border-left: 4px solid #d97706; border-radius: 0 8px 8px 0; }

  </style>

</head>

<body>

  <button type="button" id="reveal">Reveal drawer</button>

  <div id="drawer">Hidden drawer content</div>

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

  <script>

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

      $("#drawer").slideDown(600, "linear", function () {

        $(this).text("Slide complete at constant speed");

      });

    });

  </script>

</body>

</html>

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jQuery .slideDown() — linear easing (Try It)