HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getAttribute id</title>
</head>
<body>
  <div id="div1">Hi Champ!</div>
  <pre id="out"></pre>
  <script>
    var div1 = document.getElementById("div1");
    document.getElementById("out").textContent = div1.getAttribute("id");
  </script>
</body>
</html>

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Element.getAttribute — read id (Try It)