<!DOCTYPE html>

<html>
<head>
  <style>
    .box {
      height: 200px;
      width: 200px;
      background-color: blue;
    }

    .test {
      height: 200px;
      width: 200px;
      margin: 50px;
      border: 1px solid black;
      transform-style: preserve-3d;
    }

    @keyframes animate-perspective {
      0% { transform: perspective(1000px); }
      100% { transform: perspective(none); }
    }

    .inner {
      transform: rotateX(45deg);
    }
  </style>
</head>
<body>

<div class="test">
  <div class="inner box">
  </div>
</div>

<script>
    let target = document.querySelector('.test');
    getComputedStyle(target).getPropertyValue("transform");
    target.style.animationPlayState = "paused";
    target.style.animationName = 'animate-perspective';
    target.style.animationDuration = '100s';
    target.style.animationDelay = '-90s';
</script>

</body>
</html>