<!DOCTYPE html>
<title>Reference</title>
<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact">
<style>
    .grid {
        display: grid;
        float: left;
        margin: 1em;
        grid-template-rows: 40px 20px 40px;
        grid-auto-flow: column;
        justify-content: center;
        border: solid silver;
        font: 20px/1 Ahem;
        color: transparent;
    }
    .grid > div {
        background: blue;
    }
    .b {
        grid-row: 3;
    }
    .c {
        grid-row: span 3;
    }
</style>

<p>Test passes if the two shapes below are identical

<div class="grid">
    <div class="a">X</div>
    <div class="b">X</div>
    <div class="c">X<br>X<br>X<br>X<br>X</div>
</div>

<div class="grid ref">
    <div class="a">X</div>
    <div class="b">X</div>
    <div class="c">X<br>X<br>X<br>X<br>X</div>
</div>