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Test Info:

<!DOCTYPE HTML>
<html><head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
.grid {
display: grid;
grid-template-areas:
'. . a a a .'
'. . a a a .'
'. b b . . .'
;
border: 10px solid green;
grid-template-columns: 20px 20px 20px 20px;
grid-template-rows: 20px 20px 20px;
grid-auto-flow: column dense;
grid-auto-columns: 20px;
grid-auto-rows: 20px;
font-size:12px;
}
span {
background: lime;
border: 1px solid black;
}
.a {
grid-area: a;
}
.b {
grid-column: 2 / span 3;
grid-row: b;
}
.c {
grid-column: span 3;
}
.d {
grid-row: span 3;
}
</style>
</head>
<body>
<div class=grid>
<span class=a>a</span>
<span class=b>b</span>
<span class=c>c</span>
<span class=d>d</span>
</div>
</body>
</html>