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  <title>declare 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}.warn{max-width:480px;padding:.75rem 1rem;margin-bottom:1rem;background:#fff7ed;border:1px solid #fdba74;border-radius:8px;font-size:.875rem;color:#9a3412}object{display:block;max-width:400px;min-height:80px;border:1px solid #e2e8f0;border-radius:8px;background:#fff}p{font-size:.875rem;color:#64748b;max-width:480px}</style>

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  <h1>Object with declare (legacy)</h1>

  <p class=warn><strong>Obsolete:</strong> Modern browsers ignore <code>declare</code>. This example shows historical markup only.</p>

  <object data=/video/count.mp4 type=video/mp4 declare>

    <p>Your browser does not support this object.</p>

  </object>

  <p>For video today, use <code>&lt;video controls preload="metadata"&gt;</code> instead of <code>&lt;object declare&gt;</code>.</p>

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HTML declare Attribute — Object Example (Obsolete)