<!DOCTYPE html>
<html>
<body style="font-family: ahem; -webkit-font-smoothing: none;">
<style>
#container { -webkit-column-width: 100px; }
#div1 { -webkit-column-span: all; }
#summary1 { color: white; } 
</style>
<script>
document.body.offsetTop;
var container = document.createElement('div');
container.setAttribute('id', 'container');
document.body.appendChild(container); 
summary1 = document.createElement('summary');
summary1.setAttribute('id', 'summary1');
container.appendChild(summary1);
var div1 = document.createElement('div');
div1.setAttribute('id', 'div1');
summary1.style.display = 'table-row';
summary1.appendChild(document.createTextNode('a'));
summary1.appendChild(div1);
summary1.appendChild(document.createTextNode('b'));
</script>
</body>
</html>