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Test Info:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript">
function boom()
{
var y = document.createTextNode(' Y ');
document.getElementById("a").appendChild(y);
document.body.offsetHeight;
var z = document.createTextNode('Z');
document.body.insertBefore(z, document.body.lastChild);
}
</script>
</head>
<body onload="boom();"><div style="column-count: 2; width: 1px;"><div id="a">M N矋<span>م</span></div></div>H</body>
</html>