<!DOCTYPE html>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
    onload = function() {
        document.body.offsetTop;
        document.getElementById('elm').innerHTML= "x";
        document.body.offsetTop;
        document.getElementById('elm').innerHTML= "PASS";
    }
</script>
<p>No assertions should fail.</p>
<div style="-webkit-columns:2; columns:2;">
    <span id="elm">FAIL</span>
</div>