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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>longdesc — legacy vs modern</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 1rem;font-size:1.25rem;color:#0f172a}h2{font-size:1rem;margin:1.25rem 0 .5rem;color:#0f172a}.warn{padding:.75rem 1rem;background:#fffbeb;border:1px solid #fcd34d;border-radius:8px;font-size:.8125rem;color:#92400e;max-width:480px}img{display:block;max-width:280px;border:1px solid #cbd5e1;border-radius:8px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:480px}</style>

</head>

<body>

  <h1>longdesc is obsolete</h1>

  <div class=warn><strong>Legacy:</strong> <code>longdesc="longdesc.html"</code> has no reliable browser UI. Do not use on new pages.</div>



  <h2>Modern replacement</h2>

  <figure style=margin:0;max-width:280px>

    <img src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='280' height='100'%3E%3Crect fill='%23dbeafe' width='280' height='100'/%3E%3Ctext x='140' y='55' text-anchor='middle' fill='%231d4ed8' font-family='system-ui' font-size='13'%3EExample image%3C/text%3E%3C/svg%3E" alt="Example diagram" aria-describedby=modern-desc width=280 height=100>

    <figcaption style=font-size:.8125rem;margin-top:.35rem>

      <a href=#modern-desc>Long description</a>

    </figcaption>

  </figure>

  <p id=modern-desc style=font-size:.8125rem;color:#475569;max-width:480px>This on-page paragraph replaces an external longdesc URL. Screen readers can associate it via aria-describedby.</p>

</body>

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HTML longdesc Attribute — Legacy Markup (Obsolete)