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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>cloneNode shallow</title>
</head>
<body>
  <div id="card" class="box"><span>Inside</span></div>
  <pre id="out"></pre>
  <script>
    var card = document.getElementById("card");
    var shell = card.cloneNode(false);
    document.getElementById("out").textContent =
      card.children.length + "\n" +
      shell.children.length + "\n" +
      shell.className;
  </script>
</body>
</html>

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Node.cloneNode — shallow clone (Try It)