HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>referenceNode with pointer</title>
</head>
<body>
  <div id="box"><span>A</span></div>
  <pre id="out">Waiting...</pre>
  <script>
    function logAnchor(it) {
      return it.referenceNode.nodeName + " before=" + it.pointerBeforeReferenceNode;
    }
    var it = document.createNodeIterator(
      document.getElementById("box"),
      NodeFilter.SHOW_ELEMENT,
      { acceptNode: function () { return NodeFilter.FILTER_ACCEPT; } }
    );
    var lines = [logAnchor(it)];
    it.nextNode();
    lines.push(logAnchor(it));
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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referenceNode + pointerBeforeReferenceNode (Try It)