<!DOCTYPE html>
<p>There should be a blue square below.</p>
<div style="display:table; height:450px;">
    <div style="display:table-row-group;">
        <div></div>
        <div id="splitter" style="display: table-row;"></div>
        <div style="width:75px; height:50%; background:blue;"></div>
    </div>
</div>