HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>compareDocumentPosition same</title>
</head>
<body>
  <div id="box">Box</div>
  <pre id="out"></pre>
  <script>
    var el = document.getElementById("box");
    document.getElementById("out").textContent =
      String(el.compareDocumentPosition(el));
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

Node.compareDocumentPosition — same node (Try It)