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Test Info:
<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
document.documentElement.offsetHeight;
var n = document.getElementById("a").firstChild;
n.data = "";
n.data = "z";
}
</script>
</head>
<body onload="boom();" style="column-count: 3;"><span id="a">x‮</span><span>y</span></body>
</html>