HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>localName metadata</title>
</head>
<body>
  <pre id="out">Waiting...</pre>
  <script>
    var doc = new DOMParser().parseFromString(
      '<item app:id="42" xmlns:app="https://example.com/app"/>',
      "application/xml"
    );
    var item = doc.documentElement;
    var attr = item.attributes.getNamedItemNS("https://example.com/app", "id");
    document.getElementById("out").textContent = JSON.stringify({
      localName: attr.localName,
      value: attr.value,
      namespaceURI: attr.namespaceURI
    });
  </script>
</body>
</html>

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NamedNodeMap.getNamedItemNS() — localName metadata (Try It)