HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isSameNode divs</title>
</head>
<body>
  <div>This is the first element.</div>
  <div>This is the second element.</div>
  <div>This is the first element.</div>
  <pre id="out"></pre>
  <script>
    var divList = document.getElementsByTagName("div");
    document.getElementById("out").textContent =
      divList[0].isSameNode(divList[0]) + "\n" +
      divList[0].isSameNode(divList[1]) + "\n" +
      divList[0].isSameNode(divList[2]);
  </script>
</body>
</html>

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Node.isSameNode — MDN divs (Try It)