HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>animate toggle height opacity</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    p { background: #e0f2fe; padding: 12px; margin: 8px 0; border-radius: 6px; }
    button { padding: 8px 16px; margin-top: 8px; }
  </style>
</head>
<body>
  <p>First paragraph — click the button to toggle height and opacity.</p>
  <p>Second paragraph — both animate together over 600 ms.</p>
  <button type="button" id="run">Toggle all</button>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#run").on("click", function () {
      $("p").animate({
        height: "toggle",
        opacity: "toggle"
      }, "slow");
    });
  </script>
</body>
</html>

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jQuery .animate() — height/opacity toggle (Try It)