HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Basic dfn Example</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}dfn{font-style:italic;color:#1e40af}</style>
</head>
<body>
  <h1>Basic dfn Syntax</h1>
  <p>
    <dfn>HTML</dfn> (HyperText Markup Language) is the standard language for structuring web pages.
  </p>
</body>
</html>

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HTML dfn Tag — Basic Term Definition