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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
  <style>
    @keyframes -fade-in {
      from {
        opacity: 0;
      }
    }
    
    div {
      width:100px;
      height:100px;
      background:red;
      animation: -fade-in 5s;
    }
</head>
<body>
<div></div>
</body>
</html>
Output 300px

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anonymouspro
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