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Test Info:

<html class="reftest-wait">
<head>
<style>
#colset {
width: 300pt;
height: 2in;
column-count: 3;
}
.container {
height: 1in;
}
.b6 {
height: 10in;
}
.c3 {
position: absolute;
}
.c4 {
height: 3in;
}
</style>
<script>
function boom()
{
document.getElementById("x").setAttribute("class", "c4");
setTimeout(boom2, 10);
}
function boom2()
{
document.getElementById("x").setAttribute("class", "");
setTimeout(boom3, 10);
}
function boom3()
{
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="boom();">
<div id="colset">
<div id="x"></div>
<div class="container">
<div class="b6"></div>
<div>
<div class="c3"></div>
</div>
</div>
</div>
</body>
</html>