HTML Code

<!DOCTYPE html>
<html lang=ja>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>rp Japanese Reading</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:.75rem;color:#1e40af}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:400px}</style>
</head>
<body>
  <h1>Japanese reading aid</h1>
  <ruby>
    東京 <rp>(</rp><rt>とうきょう</rt><rp>)</rp>
  </ruby>
  <p class=hint>Browsers that support ruby hide &lt;rp&gt; and show &lt;rt&gt; above the base text.</p>
</body>
</html>

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HTML rp Tag — Japanese Reading