HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .outerHeight callback</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #panel {
      width: 200px;
      padding: 16px;
      border: 2px solid #dc2626;
      background: #fee2e2;
      cursor: pointer;
      min-height: 48px;
    }
    .hint { margin-top: 10px; color: #64748b; font-size: 14px; }
  </style>
</head>
<body>
  <div id="panel">Click to shrink outer height by 12px each time.</div>
  <p class="hint">Current outerHeight: <strong id="val">—</strong></p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    function showVal() {
      $("#val").text($("#panel").outerHeight() + "px");
    }
    showVal();
    $("#panel").on("click", function() {
      $(this).outerHeight(function(index, height) {
        return Math.max(48, height - 12);
      });
      showVal();
    });
  </script>
</body>
</html>

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jQuery .outerHeight(function) — shrink on click (Try It)