HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>document.append root</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var doc = new Document();
    var html = doc.createElement("html");
    doc.append(html);
    document.getElementById("out").textContent =
      "children: " + doc.children.length + "\n" +
      "documentElement match: " + (doc.documentElement === html);
  </script>
</body>
</html>

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Document.append — root html on new Document (Try It)