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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>NodeList.keys()</title>
</head>
<body>
  <pre id="out">Waiting...</pre>
  <script>
    var node = document.createElement("div");
    node.appendChild(document.createElement("p"));
    node.appendChild(document.createTextNode("hey"));
    node.appendChild(document.createElement("span"));
    var list = node.childNodes;
    var lines = [];
    for (var key of list.keys()) {
      lines.push(String(key));
    }
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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NodeList.keys() — basic (Try It)