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<!DOCTYPE html>
<html class="reftest-wait">
<head>
  <title>Testcase Bug 851514</title>
  <style>
  #parent {
    position: fixed;
    height: 30px;
    width: 30px;
    background: green;
    left: 70px;
    top: 70px;
    overflow:hidden;
    display: none; /* So we can make sure there is only one frame construction
                      and one reflow for the parent + child thing */
  }
  #child {
    position: fixed;
    top: auto;
    left: auto;
    width: 10px;
    height: 10px;
    background: purple;
  }
  </style>
  <script>
    function doTest() {
      var par = document.getElementById("parent");
      // Flush layout
      par.getBoundingClientRect();
      par.style.display = "block";
      document.documentElement.className = "";
    }
  </script>
</head>
<body onload="doTest();">
  <div id="parent">
    <div id="child"></div>
  </div>
  The purple block should be inside the green block.
</body>
</html>