<!DOCTYPE html>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
</script>
<p>PASS if no crash or assertion failure.</p>
<div style="-webkit-columns:7;">
    <div style="width:300px; -webkit-columns:2;">
        <div style="backface-visibility:hidden; height:200px;"></div>
        <div style="height:800px; -webkit-columns:2;"></div>
    </div>
</div>