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<!DOCTYPE HTML>
<html>
<meta charset="utf-8">
<style>
.grid {
display: inline-grid;
grid-template-columns: repeat(4, auto);
grid-template-rows: auto auto;
border: 1px solid;
}
item {
width: 10px;
height: 40px;
background: grey;
}
.subgrid {
display: grid;
grid: auto / subgrid;
grid-column: 1 / span 4;
border: 0 solid lightblue;
border-right-width: 80px;
background: yellow;
}
.subgrid > item { background: lightgrey; }
</style>
<div class="grid">
<item>1</item>
<item>2</item>
<item>3</item>
<item style="width: 100%;">4</item>
<div class="subgrid">
<item>a</item>
<item>b</item>
</div>
</div>
</html>