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Test Info:
<!DOCTYPE html>
<html class="reftest-wait">
<head>
<style>
  .fl:first-line { }
  .inh { position: inherit; }
  .abs { position: absolute; }
</style>
 
<script>
var x, y;
function boom()
{
  x = document.getElementById("x");
  y = document.getElementById("y");
  x.setAttribute('class', "fl abs");
  y.setAttribute('class', "inh");
  setTimeout(boom2, 5);
}
function boom2()
{
  y.setAttribute('class', "abs");
  
  document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="setTimeout(boom, 5);">
<div id="x">
  <p id="y">foo</p>
</div>
</body>
</html>