HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>two roots</title>
</head>
<body>
  <div id="box"><span>A</span></div>
  <ul id="fruit"><li>Apple</li></ul>
  <pre id="out">Waiting...</pre>
  <script>
    var itBox = document.createNodeIterator(
      document.getElementById("box"),
      NodeFilter.SHOW_ELEMENT
    );
    var itList = document.createNodeIterator(
      document.getElementById("fruit"),
      NodeFilter.SHOW_ELEMENT
    );
    document.getElementById("out").textContent = itBox.root.id + "\n" + itList.root.id;
  </script>
</body>
</html>

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NodeIterator.root — two iterators (Try It)