HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>header vs tag list</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    #output { margin-top: 12px; padding: 12px; background: #fef3c7; font-family: monospace; white-space: pre-wrap; }
  </style>
</head>
<body>
  <h1>Title</h1>
  <h2>Section</h2>
  <h3>Subsection</h3>
  <p>Paragraph — not a heading.</p>
  <div id="output"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#output").text(
      ":header → " + $(":header").length + "\ntag list → " + $("h1, h2, h3, h4, h5, h6").length
    );
  </script>
</body>
</html>

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:header vs h1–h6 tag list (Try It)