HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>modern animation alternatives</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 32rem; }
    .panel {
      padding: 16px;
      margin: 12px 0;
      border-radius: 8px;
      border: 2px solid #cbd5e1;
    }
    #cssBox {
      background: #dbeafe;
      transition: opacity 0.6s ease;
      opacity: 1;
    }
    #cssBox.dim { opacity: 0.35; }
    #jqBox { background: #fef3c7; }
    button { margin: 4px 8px 4px 0; padding: 8px 12px; }
    p { color: #64748b; font-size: 14px; }
  </style>
</head>
<body>
  <div class="panel" id="cssBox">CSS transition — preferred for simple opacity</div>
  <button type="button" id="cssToggle">Toggle CSS opacity</button>
  <div class="panel" id="jqBox">jQuery .fadeTo() — legacy fx pipeline</div>
  <button type="button" id="jqToggle">jQuery fadeTo 0.35</button>
  <p>Do not tune fx.interval in new projects — use CSS or Web Animations API instead.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#cssToggle").on("click", function () {
      $("#cssBox").toggleClass("dim");
    });
    $("#jqToggle").on("click", function () {
      var op = parseFloat($("#jqBox").css("opacity")) > 0.5 ? 0.35 : 1;
      $("#jqBox").fadeTo(600, op);
    });
  </script>
</body>
</html>

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jQuery.fx.interval — modern alternatives (Try It)