<html class="reftest-wait">
  <head>
    <style>
    div {
      width: 200px;
      height: 200px;
    }
    .positioned {
      position: absolute;
      top: 0px;
      left: 200px;
      background-color: green;
    }
    .outer {
      position: relative;
    }
    </style>
  </head>
  <body>
    <div class="outer">
      <div id="test"></div>
      <div class="positioned"></div>
    </div>
    <script>
      function doTest() {
        document.getElementById("test").style.backgroundColor = "green";
        document.documentElement.removeAttribute("class");
      }
      document.addEventListener("MozReftestInvalidate", doTest);
    </script>
  </body>
</html>