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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isEqualNode attrs</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var a = document.createElement("button");
    var b = document.createElement("button");
    a.textContent = b.textContent = "Save";
    a.id = "save-a";
    b.id = "save-b";
    var before = a.isEqualNode(b);
    b.id = "save-a";
    var after = a.isEqualNode(b);
    document.getElementById("out").textContent = before + "\n" + after;
  </script>
</body>
</html>

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Node.isEqualNode — attributes matter (Try It)