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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">

  <style>
    div {
      opacity: 0;
      height: 0;
      background: red;
      border-top: 1px solid #888;
      transition-property: height, opacity;
      transition-duration: 3000ms;
      transition-timing-function: ease-in-out, ease-in-out, linear;
    }

    div[visible] {
      opacity: 1;
      height: 200px;
    }
  </style>
</head>
<body>
  <div></div>
</body>
</html>