<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>CSS Test: rotateY with perspective produces a trapezoid</title>
  <link rel="author" title="Apple Inc." href="http://www.apple.com/"/>
  <link rel="help" href="http://www.w3.org/TR/css-transforms-2/#3d-transform-rendering"/>
  <link rel="match" href="reference/transform-3d-rotateY-stair-above-ref-001.xht"/>
  <meta name="flags" content="" />
  <meta name="assert" content="A rotateY transform with perspective
  should result in a trapezoid."/>
  <style type="text/css"><![CDATA[
div {
  height: 150px;
  width: 150px;
}
.background {
  background-color: green;
  height: 200px;
  width: 200px;
}
.container {
  position: absolute;
  top: 20px;
  left: 0;
  perspective: 500px;
}
.transformed {
  background-color: red;
  transform: rotateY(50deg);
}
.stair {
  background-color: green;
  position: absolute;
}
#one {
  width: 33px;
  height: 170px;
  top: 10px;
  left: 20px;
}
#two {
  width: 33px;
  height: 158px;
  top: 16px;
  left: 53px;
}
#three {
  width: 33px;
  height: 147px;
  top: 21px;
  left: 86px;
}
.stairs {
  height: 180px;
}
  ]]></style>
 </head>
 <body>
<div class="background">
<div class="container">
  <div class="transformed"></div>
</div>
<div class="stairs">
  <div id="one" class="stair"></div>
  <div id="two" class="stair"></div>
  <div id="three" class="stair"></div>
</div>
</div>
<p>You should see a green box. There should be no red.</p>
</body>
</html>