HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>@media (min-color-index: 256)</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0;
      color: #334155;
      font-size: 1.125rem;
      line-height: 1.5;
    }

    @media (min-color-index: 256) {
      p {
        color: #1475ef;
      }
    }
  </style>
</head>
<body>
  <p>Blue when the palette has 256+ entries.</p>
</body>
</html>

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CSS color-index Media Feature — min-color-index: 256