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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>childNodes loop</title>
</head>
<body>
  <p id="para">Hello <span>world</span>!</p>
  <pre id="out"></pre>
  <script>
    var para = document.getElementById("para");
    var lines = [];
    if (para.hasChildNodes()) {
      for (var node of para.childNodes) {
        lines.push(node.nodeName + " " + node.nodeType);
      }
    }
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Node.childNodes — loop (Try It)