<!DOCTYPE html>
<script>
if (window.testRunner)
testRunner.dumpAsText();
</script>
<p>PASS if no crash or assertion failure.</p>
<div id="root">
<div style="width:100px;">
<div style="column-span:all;"></div>
</div>
</div>
<script>
document.body.offsetTop;
document.getElementById("root").style.columns = "2";
</script>