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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getAttributeNames loop</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var element = document.createElement("a");
    element.setAttribute("href", "https://example.com");
    element.setAttribute("target", "_blank");
    var lines = [];
    element.getAttributeNames().forEach(function (name) {
      lines.push(name + " " + element.getAttribute(name));
    });
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Element.getAttributeNames — loop with getAttribute (Try It)