HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>fx.off instant vs animated</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 32rem; }

    button { padding: 8px 14px; margin: 0 8px 12px 0; }

    #stage { position: relative; height: 80px; margin: 16px 0; border: 1px dashed #cbd5e1; border-radius: 8px; }

    #fade-box { width: 60px; height: 40px; background: #3b82f6; border-radius: 6px; margin: 12px; }

    #move-box { width: 50px; height: 50px; background: #f97316; border-radius: 6px; position: absolute; top: 12px; left: 0; }

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

  </style>

</head>

<body>

  <button type="button" id="run-off">Run with fx.off = true</button>

  <button type="button" id="run-on">Run with fx.off = false</button>

  <p id="mode">Click a button to compare instant vs smooth tweens.</p>

  <div id="stage">

    <div id="fade-box"></div>

    <div id="move-box"></div>

  </div>

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

  <script>

    $("#run-off").on("click", function () {

      jQuery.fx.off = true;

      $("#fade-box").hide().fadeIn(800);

      $("#move-box").css({ left: 0 }).animate({ left: 240 }, 800);

      $("#mode").text("fx.off = true — instant end states (one frame)");

    });

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

      jQuery.fx.off = false;

      $("#fade-box").hide().fadeIn(800);

      $("#move-box").css({ left: 0 }).animate({ left: 240 }, 800);

      $("#mode").text("fx.off = false — smooth 800 ms tweens");

    });

  </script>

</body>

</html>

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jQuery.fx.off — instant vs animated (Try It)