HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .innerWidth setter</title>
  <style>
    div {
      width: 60px;
      padding: 10px;
      height: 50px;
      float: left;
      margin: 5px;
      background: red;
      cursor: pointer;
      color: #fff;
      font-family: sans-serif;
      text-align: center;
    }
    .mod { background: blue; cursor: default; }
    .hint { clear: both; padding-top: 80px; color: #64748b; font-size: 14px; }
  </style>
</head>
<body>
  <div>d</div>
  <div>d</div>
  <div>d</div>
  <div>d</div>
  <div>d</div>
  <p class="hint">Click each box once — innerWidth shrinks by 8px each click.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var modWidth = 60;
    $("div").one("click", function() {
      $(this).innerWidth(modWidth).addClass("mod");
      modWidth -= 8;
    });
  </script>
</body>
</html>

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jQuery .innerWidth(60) — setter on click (Try It)