mozilla-release/gfx/tests/reftest/1086723-ref.html

<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <title>Testcase for bug 1086723</title>
  <style type="text/css">
    .test_div {
      position: fixed;
      overflow: hidden;
      background: blue;
      width: 50%;
      height: 50%;
      border-radius: 0px 50% 50% 0px;
    }
    .filler {
      height: 5000px;
    }
    body,html {
      overflow: hidden;
    }
  </style>
</head>
<body>
  <div class="test_div"></div>
  <div class="filler"></div>
</body>
</html>