HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery .outerWidth callback</title>

  <style>

    body { font-family: sans-serif; padding: 16px; }

    #panel {

      width: 220px;

      padding: 16px;

      border: 2px solid #7c3aed;

      background: #ede9fe;

      cursor: pointer;

      min-width: 80px;

      display: inline-block;

    }

    .hint { margin-top: 10px; color: #64748b; font-size: 14px; }

  </style>

</head>

<body>

  <div id="panel">Click to shrink outer width by 15px each time.</div>

  <p class="hint">Current outerWidth: <strong id="val">—</strong></p>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    function showVal() {

      $("#val").text($("#panel").outerWidth() + "px");

    }

    showVal();

    $("#panel").on("click", function() {

      $(this).outerWidth(function(index, width) {

        return Math.max(80, width - 15);

      });

      showVal();

    });

  </script>

</body>

</html>

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