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  <title>dfn id Cross-Reference</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7;max-width:520px}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}dfn{font-style:italic;color:#1e40af}a{color:#2563eb}.glossary{margin-top:1.25rem;padding:1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}.glossary h2{margin:0 0 .5rem;font-size:1rem;color:#0f172a}</style>
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  <h1>dfn with id</h1>
  <p>
    Later in this page we mention
    <a href=#def-api>API</a>
    — scroll to the glossary for its definition.
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  <section class=glossary id=glossary>
    <h2>Glossary</h2>
    <p>
      <dfn id=def-api>API</dfn> (Application Programming Interface) lets software applications communicate with each other.
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dfn with id for Cross-References