css/css-backgrounds/reference/css3-box-shadow-ref.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>CSS Box-shadow Test: the test passes if adding one or more shadow to the box</title>
  <link rel="author" title="Xie Bing" href="mailto:451887565@qq.com">
  <link rel="reviewer" title="Dayang Shen" href="mailto:shendayang@baidu.com"> <!-- 2013-09-03 -->
  <style type="text/css">
    .wrapper{
      position:relative;
    }
    .first{
      width:300px;
      height:100px;
      background-color:#ff9900;
      position:absolute;
      z-index:500;
    }
    .second{
      width:300px;
      height:100px;
      background-color:#000;
      position:absolute;
      top:10px;
      left:10px;
      z-index:100;
    }
  </style>
</head>
<body>
  <p>The test passes if there is a black shadow behind the orange box.</p>
  <div class="wrapper">
    <div class="first"></div>
    <div class="second"></div>
  </div>
</body>
</html>