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<!DOCTYPE html>
<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
<link rel="help" href="https://drafts.csswg.org/css-gaps-1/">
<style>
body {
margin: 0;
}
.scene {
height: 190px;
position: relative;
width: 120px;
}
.lanes {
background: lightgray;
display: grid-lanes;
grid-template-rows: repeat(3, 50px);
height: 190px;
row-gap: 20px;
width: 120px;
}
.subgrid {
column-gap: 20px;
display: grid;
grid-row: 1 / span 3;
grid-template-columns: repeat(2, 50px);
grid-template-rows: subgrid;
}
.cell {
background: teal;
}
.top-left {
grid-column: 1;
grid-row: 1;
}
.top-right {
grid-column: 2;
grid-row: 1;
}
.middle-left {
grid-column: 1;
grid-row: 2;
}
.row-rule {
background: gold;
height: 6px;
left: 0;
position: absolute;
top: 57px;
width: 50px;
}
</style>
<div class="scene">
<div class="lanes">
<div class="subgrid">
<div class="cell top-left"></div>
<div class="cell top-right"></div>
<div class="cell middle-left"></div>
</div>
</div>
<div class="row-rule"></div>
</div>