<!DOCTYPE html>
<script>
    onload = function() {
        document.documentElement.scrollTop = 10000;
    }
</script>
<div style="position:fixed;">
    <p>Test that overflow on a spanner is propagated all the way up to the viewport.</p>
    <p>You should see the word 'PASS' below.</p>
</div>
<div style="height:4em; -webkit-columns:4;">
    <div style="-webkit-column-span:all; height:2em;">
        <div style="height:200vh;"></div>
        PASS
    </div>
</div>