HTML Code

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

    p {
      margin: 0;
      max-width: 40rem;
      line-height: 1.5;
      padding: 12px;
      background: #e2e8f0;
      color: #475569;
    }

    /* Historical only — will not match in browsers */
    @media (light-level: normal) {
      p {
        background: #dbeafe;
        color: #1e3a8a;
      }
    }
  </style>
</head>
<body>
  <p><strong>(light-level: normal)</strong> — removed / never implemented. You see the default styles.</p>
</body>
</html>

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CSS light-level Media Feature — normal (historical)