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Test Info:

<!DOCTYPE HTML>
<html><head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<style type="text/css">
.p { marker: url('#c'); }
</style>
<script type="text/javascript">
function boom()
{
document.getElementById("a").setAttribute("class", "p");
document.documentElement.offsetHeight;
document.getElementById("b").setAttribute("id", "c");
}
</script>
</head><body onload="boom();"><div class="p" id="a">C</div><div id="c"></div></body></html>