HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>fadeTo first paragraph</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    p { cursor: pointer; padding: 8px 0; }
  </style>
</head>
<body>
  <p>Click this paragraph to see it fade to 33% opacity.</p>
  <p>Compare to this one that won't fade.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("p").first().on("click", function () {
      $(this).fadeTo("slow", 0.33);
    });
  </script>
</body>
</html>

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jQuery .fadeTo() — first paragraph to 0.33 (Try It)