<!DOCTYPE html>
<html>
<head>
</head>
<body onload="document.getElementById('x').appendChild(document.createTextNode('b'));">
<div style="display: -moz-grid;"><div style="-moz-column-count: 2;">a<div id="x" style="padding: 1em;"></div><wbr></div></div>
</body>
</html>