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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>basefont size Legacy</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155}h1{margin:0 0 .5rem;font-size:1.25rem;color:#0f172a}p{margin:0 0 .75rem;line-height:1.6;font-size:.95rem}.note{background:#fef2f2;border:1px solid #fecaca;border-radius:8px;padding:.75rem 1rem;font-size:.875rem;color:#991b1b}</style>

</head>

<body>

  

  <basefont size=4>

  <h1>Default Font Size Example</h1>

  <p>This paragraph would inherit size="4" in legacy browsers.</p>

  <p class=note><strong>Deprecated:</strong> Use <code>body { font-size: 1.125rem; }</code> in CSS instead.</p>

</body>

</html>

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HTML basefont Tag — size Attribute (Legacy)