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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>bracket alias</title>
</head>
<body>
  <p class="note">Text</p>
  <pre id="out">Waiting...</pre>
  <script>
    var el = document.querySelector(".note");
    var map = el.attributes;
    var viaMethod = map.getNamedItem("class");
    var viaBracket = map["class"];
    document.getElementById("out").textContent = String(viaMethod === viaBracket);
  </script>
</body>
</html>

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NamedNodeMap.getNamedItem() — bracket alias (Try It)