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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>children vs childNodes</title>
</head>
<body>
  <div id="box">
    <span>A</span>
    <span>B</span>
  </div>
  <pre id="out"></pre>
  <script>
    var box = document.getElementById("box");
    document.getElementById("out").textContent = JSON.stringify({
      childrenLength: box.children.length,
      childElementCount: box.childElementCount,
      childNodesLength: box.childNodes.length
    }, null, 2);
  </script>
</body>
</html>

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Element.children — vs childNodes (Try It)