<!DOCTYPE html>
<html xmlns="
http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript">
function addSheet(text)
{
var head = document.getElementsByTagName("head")[0];
var sheet = document.createElement("style");
sheet.appendChild(document.createTextNode(text));
head.appendChild(sheet);
}
</script>
<style>colgroup:before { content: '0'; }</style>
</head>
<body onload="addSheet('x { }');"><table><colgroup></colgroup></table></body>
</html>
