HTML Code

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

    .mono {
      display: none;
      max-width: 40rem;
      line-height: 1.5;
      color: #333;
    }

    .hint {
      max-width: 40rem;
      line-height: 1.5;
      color: #64748b;
    }

    @media (monochrome) {
      .mono {
        display: block;
      }
      .hint {
        display: none;
      }
    }
  </style>
</head>
<body>
  <p class="hint"><strong>(monochrome)</strong> — hidden on color screens; shown on mono devices.</p>
  <p class="mono">Your device reports a monochrome frame buffer.</p>
</body>
</html>

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CSS monochrome Media Feature — boolean