HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS scan animation Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      text-align: center;
    }

    .pulse {
      display: inline-block;
      padding: 0.75rem 1.25rem;
      background: #3b82f6;
      color: #fff;
      border-radius: 0.5rem;
      animation: pulse 1.5s ease-in-out infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.5; }
    }

    @media (scan: interlace) {
      .pulse {
        animation: none;
        opacity: 1;
        background: #16a34a;
      }
    }
  </style>
</head>
<body>
  <h1>Animation Demo</h1>
  <p class="pulse">Pulsing on progressive; static green on interlace.</p>
</body>
</html>

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CSS scan - Reduce Motion on Interlace