HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>item loop</title>
</head>
<body>
  <div id="demo" class="card" data-role="panel">Demo</div>
  <pre id="out">Waiting...</pre>
  <script>
    var box = document.querySelector("#demo");
    var map = box.attributes;
    var lines = [];
    for (var i = 0; i < map.length; i++) {
      var attr = map.item(i);
      lines.push(attr.name + "=" + attr.value);
    }
    document.getElementById("out").textContent = lines.join(", ");
  </script>
</body>
</html>

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NamedNodeMap.item() — loop with length (Try It)