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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>Dynamic 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>Dynamic color with JavaScript</h1>
  <p><font id=dynamicText>This text will turn red using JavaScript.</font></p>
  <script>document.getElementById("dynamicText").setAttribute("color","#ff0000")</script>
  <p class=hint>Use <code>setAttribute("color", ...)</code> on legacy elements, or <code>style.color</code> for modern CSS styling.</p>
</body>
</html>

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HTML color Attribute — Dynamic JavaScript