<div style="display: -webkit-box; -webkit-box-orient: vertical;">
    <div style="width: 80px; height: 80px; background-color: blue;">
        <div id="float" style="float: left; width: 20px; height: 110px; background-color: silver;"></div>
    </div>
    <div style="font-family: ahem; width: 80px; height: 80px; background-color: yellow;">Test overhanging floats</div>
</div>
<script>
    document.body.offsetTop;
    document.getElementById("float").style.display = "none";
</script>