HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .height accordion</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 360px; }
    .acc-head {
      padding: 10px 14px;
      background: #1e293b;
      color: #fff;
      cursor: pointer;
      border-radius: 4px;
    }
    .acc-body {
      overflow: hidden;
      height: 0;
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-top: none;
      border-radius: 0 0 4px 4px;
    }
    .acc-inner { padding: 12px 14px; }
  </style>
</head>
<body>
  <div class="acc-head">Toggle section</div>
  <div class="acc-body">
    <div class="acc-inner">
      jQuery .height() returns a unitless pixel number — ideal for math and
      animations like this accordion panel.
    </div>
  </div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var open = false;
    var fullHeight = 0;
    $(".acc-head").on("click", function() {
      var $body = $(".acc-body");
      if (!fullHeight) {
        $body.css("height", "auto");
        fullHeight = $body.height();
        $body.height(0);
      }
      open = !open;
      $body.animate({ height: open ? fullHeight : 0 }, 300);
    });
  </script>
</body>
</html>

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jQuery .height() — accordion panel toggle (Try It)