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<!DOCTYPE html>
<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
<style>
body { margin: 0; }
.case { position: relative; }
.lanes {
background: #cdd5e0;
display: grid-lanes;
gap: 20px;
grid-lanes-direction: row;
grid-template-rows: repeat(2, 60px);
width: max-content;
}
.lanes > div {
background: #5b8def;
grid-row: 1;
width: 40px;
}
.lanes > .spanner {
background: #8a6df0;
grid-row: 1 / -1;
}
.row-rule {
border-top: 4px solid blue;
height: 0;
position: absolute;
top: 68px;
width: 40px;
}
</style>
<div class="case">
<div class="lanes">
<div></div>
<div class="spanner"></div>
<div></div>
</div>
<div class="row-rule" style="left: 0;"></div>
<div class="row-rule" style="left: 120px;"></div>
</div>