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Test Info:

<html>
<head>
<script type="text/javascript">
function boom()
{
var img = document.createElement("img");
document.getElementById("g").appendChild(img);
img.width = 1;
}
</script>
<style type="text/css">
.margin {
margin: 1em 0;
}
.dd:before {
white-space: pre;
line-height: 0;
content: "b";
}
</style>
</head>
<body onload="boom();">
<div style="column-count: 2;">
X
<div class="margin">y</div>
<span><span id="g"></span>&shy;<div class="margin"></div><span class="dd"><div></div></span></span>
</div>
</body>
</html>