<!DOCTYPE html>
<html>
  <head>
    <style>
      body {
          overflow: hidden;
      }

      #perspective {
          -webkit-perspective: 1000px;
          position: absolute;
          width: 600px;
          left: -600px;
      }

      #transformed {
          transform: rotateY(90deg);
          -webkit-transform-origin: right;
          background: green;
          height: 800px;
      }

      #container {
          position: relative;
          overflow: hidden;
          width: 800px;
          height: 600px;
      }
    </style>
  </style>
  </head>
  <body>
    <!-- The green rectangle should be visible. -->
    <div id="container">
        <div id="perspective">
            <div id="transformed"></div>
        </div>
    </div>
  </body>
</html>