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Test Info:

<!DOCTYPE html>
<html>
<head>
<style type="text/css">
div { height: 1px; }
</style>
<script type="text/javascript">
function boom()
{
var a = document.getElementById("a");
a.firstChild.remove();
document.documentElement.style.outline = "none";
}
</script>
</head>
<body onload="boom();">
<div style="column-count: 2;" id="a"><div><div style="float: right;"><div></div><span><div></div></span></div></div></div>
</body>
</html>