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<!DOCTYPE html>
<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
<style>
body { margin: 0; }
.lanes {
display: grid-lanes;
grid-template-columns: repeat(3, 60px);
grid-lanes-pack: dense;
flow-tolerance: 0;
gap: 10px;
background: #cdd5e0;
width: max-content;
}
.lanes > div {
background: #5b8def;
color: #fff;
font: 600 12px/1 sans-serif;
}
.lanes > div.tall { height: 100px; }
.lanes > div.last-track { grid-column: 3; height: 40px; }
.lanes > div.full-span { grid-column: 1 / -1; height: 40px; }
.lanes > div.dense-spanner {
grid-column: span 2;
height: 20px;
background: #8a6df0;
}
.col-rule { position: absolute; width: 0; border-left: 4px solid blue; }
.row-rule { position: absolute; height: 0; border-top: 4px solid gold; }
</style>
<div class="lanes">
<div class="tall">1</div>
<div class="last-track">2</div>
<div class="full-span">3 (span 3)</div>
<div class="dense-spanner">4 (dense span 2)</div>
</div>
<div class="col-rule" style="left: 63px; top: 0; height: 100px;"></div>
<div class="col-rule" style="left: 133px; top: 0; height: 40px;"></div>
<div class="col-rule" style="left: 133px; top: 80px; height: 20px;"></div>
<div class="row-rule" style="top: 43px; left: 70px; width: 130px;"></div>
<div class="row-rule" style="top: 103px; left: 0; width: 200px;"></div>