HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>migrate to documentElement</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var root = document.documentElement;
    document.getElementById("out").textContent = "lang: " + (root.lang || "(not set)");
  </script>
</body>
</html>

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rootElement — migrate to documentElement (Try It)