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<!DOCTYPE html>
<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
<style>
body {
margin: 0;
}
.scene {
height: 180px;
position: relative;
width: 140px;
}
.lanes {
background: lightgray;
column-gap: 20px;
display: grid-lanes;
grid-template-columns: repeat(2, 60px);
height: 180px;
row-gap: 20px;
width: 140px;
}
.parent-item {
background: purple;
height: 30px;
}
.first {
grid-column: 1;
}
.second {
grid-column: 2;
}
.subgrid {
column-gap: 8px;
display: grid;
grid-column: 1 / span 2;
grid-template-columns: subgrid;
grid-template-rows: repeat(2, 30px);
row-gap: 20px;
}
.cell {
background: teal;
}
.parent-rule,
.child-rule {
position: absolute;
}
.parent-rule {
background: red;
height: 30px;
left: 66px;
width: 8px;
}
.parent-before {
top: 0;
}
.parent-after {
top: 150px;
}
.child-rule {
background: lime;
height: 80px;
left: 69px;
top: 50px;
width: 2px;
}
</style>
<div class="scene">
<div class="lanes">
<div class="parent-item first"></div>
<div class="parent-item second"></div>
<div class="subgrid">
<div class="cell"></div>
<div class="cell"></div>
<div class="cell"></div>
<div class="cell"></div>
</div>
<div class="parent-item first"></div>
<div class="parent-item second"></div>
</div>
<div class="parent-rule parent-before"></div>
<div class="parent-rule parent-after"></div>
<div class="child-rule"></div>
</div>