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<!DOCTYPE html>
<html lang=ja>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>rt Ruby Text</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}p{margin:0 0 .75rem;font-size:.9375rem}ruby{font-size:1.5rem}rt{font-size:.75rem;color:#1e40af}.hint{font-size:.8125rem;color:#64748b;max-width:360px}</style>
</head>
<body>
  <h1>rt ruby text</h1>
  <p>Japanese reading aid:</p>
  <p><ruby>東京<rt>とうきょう</rt></ruby></p>
  <p class=hint>&lt;rt&gt; holds the annotation shown above the base characters.</p>
</body>
</html>

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HTML rb Alternative — rt Tag