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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>height — iframe 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 1rem;font-size:1.25rem;color:#0f172a}iframe{display:block;max-width:100%;border:1px solid #cbd5e1;border-radius:8px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>height — iframe</h1>
  <iframe srcdoc="&lt;!DOCTYPE html&gt;&lt;body style='font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#e0f2fe;color:#334155;'&gt;Embedded panel (height set by parent iframe)&lt;/body&gt;" width=100% height=180 title="Embedded example panel" style=border:none></iframe>
  <p class=hint><code>height="180"</code> on <code>&lt;iframe&gt;</code> sets the frame height in pixels. Percentages are also allowed on iframes.</p>
</body>
</html>

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HTML height Attribute — iframe Height