HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS min-color-index Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 2rem;
      margin: 0;
    }

    @media (min-color-index: 256) {
      body {
        background-color: #dbeafe;
      }
      p {
        color: #1e3a8a;
      }
    }
  </style>
</head>
<body>
  <h1>256+ Palette Colors</h1>
  <p>Light blue background on devices with at least 256 palette entries.</p>
</body>
</html>

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CSS color-index - min-color-index 256