HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS color-gamut Fallback Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      margin: 0;
    }

    .card {
      padding: 1rem;
      border-radius: 0.5rem;
      border: 1px solid #e2e8f0;
      max-width: 18rem;
    }

    @media (color-gamut: srgb) {
      .card {
        background: #eff6ff;
        border-color: #93c5fd;
      }
    }

    @media (color-gamut: p3) {
      .card {
        background: color(display-p3 0.85 0.95 1);
        border-color: color(display-p3 0.35 0.65 1);
      }
    }
  </style>
</head>
<body>
  <h1>Feature Card</h1>
  <div class="card">
    <strong>Wide-Gamut Card</strong>
    <p>sRGB-safe with P3 enhancement on capable displays.</p>
  </div>
</body>
</html>

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CSS color-gamut - sRGB Fallback Card