HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS animation-duration Compare Example</title>
  <style>
    @keyframes bounce {
      from { transform: translateY(0); }
      to { transform: translateY(-20px); }
    }

    .box {
      width: 60px;
      height: 60px;
      border-radius: 0.5rem;
      animation: bounce ease-in-out infinite alternate;
    }

    .fast {
      background: #6366f1;
      animation-duration: 0.5s;
      margin-right: 1rem;
    }

    .slow {
      background: #ea580c;
      animation-duration: 3s;
    }
  </style>
</head>
<body>
  <h1>Fast vs Slow Duration</h1>

  <div class="box fast"></div>
  <div class="box slow"></div>
</body>
</html>

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CSS animation-duration Property - Fast vs Slow