HTML Code

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>rt Pronunciation</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;
    }
    ruby {
      font-size: 1.5rem;
    }
    rt {
      font-size: 0.75rem;
      color: #1e40af;
    }
    .hint {
      margin-top: 1rem;
      font-size: 0.8125rem;
      color: #64748b;
      max-width: 360px;
    }
  </style>
</head>
<body>
  <h1>Providing pronunciation</h1>
  <ruby>
    音<rt>on</rt>
    楽<rt>gaku</rt>
  </ruby>
  <p class="hint">&lt;rt&gt; shows reading hints above each base character.</p>
</body>
</html>

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HTML rt Tag — Pronunciation