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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>RGB Text Color Example</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}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>
</head>
<body>
  <h1>RGB text color via CSS</h1>
  <p style=color:#00f>This text is in blue color.</p>
  <p class=hint>The legacy HTML <code>color</code> attribute does not support <code>rgb()</code>. Use CSS <code>color</code> instead.</p>
</body>
</html>

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HTML color Attribute — RGB via CSS