HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getAttributeNode data</title>
</head>
<body>
  <div id="card" data-role="primary">Card</div>
  <pre id="out"></pre>
  <script>
    var card = document.getElementById("card");
    var dataAttr = card.getAttributeNode("data-role");
    document.getElementById("out").textContent =
      dataAttr.name + "\n" + dataAttr.value;
  </script>
</body>
</html>

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Element.getAttributeNode — data-role Attr (Try It)