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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>width vs innerWidth vs outerWidth</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #box {
      width: 120px;
      padding: 12px;
      border: 4px solid #333;
      margin: 8px 0;
      background: #dbeafe;
    }
    #out { font-family: monospace; line-height: 1.9; }
  </style>
</head>
<body>
  <div id="box">Sample content</div>
  <div id="out"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var $box = $("#box");
    var lines = [
      ".width()       → " + $box.width() + "px (content only)",
      ".innerWidth()  → " + $box.innerWidth() + "px (content + padding)",
      ".outerWidth()  → " + $box.outerWidth() + "px (content + padding + border)"
    ];
    $("#out").html(lines.join("<br>"));
  </script>
</body>
</html>

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jQuery .width() vs .innerWidth() vs .outerWidth() (Try It)