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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 CSS Alternative</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:1.375rem}.pronunciation{font-size:.7rem;color:#64748b}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>
</head>
<body>
  <h1>rt-only alternative</h1>
  <ruby>
    漢<rt class=pronunciation>kan</rt>
  </ruby>
  <p class=hint>Apply class on &lt;rt&gt; or &lt;ruby&gt; instead of styling obsolete &lt;rtc&gt;.</p>
</body>
</html>

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HTML rtc Alternative — rt with CSS