HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>clientWidth compare</title>
</head>
<body>
  <div id="box" style="width:200px;padding:10px;border:5px solid #333;box-sizing:content-box;">Hello</div>
  <pre id="out"></pre>
  <script>
    var box = document.getElementById("box");
    document.getElementById("out").textContent = JSON.stringify({
      clientWidth: box.clientWidth,
      offsetWidth: box.offsetWidth,
      scrollWidth: box.scrollWidth
    }, null, 2);
  </script>
</body>
</html>

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Element.clientWidth — compare sizes (Try It)