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<!DOCTYPE html>
<html>
<style>
.grid {
display: grid;
grid-template-rows: repeat(4, 50px);
grid-auto-flow: dense;
}
.flex {
display: flex;
flex-direction: row;
}
</style>
<body>
<p>Ensure that dense-packing places multi-spanning item into highest eligible track opening. The yellow item is the item that should be placed in track opening.</p>
<div class="grid">
<div class="flex">
<div style="background: lightskyblue; width: 70px;" >
1
</div>
<div style="background: lightsteelblue; width: 20px; height: 200px;" >
4
</div>
</div>
<div style="background: yellow; width: 10px; grid-row: span 2;" >
5
</div>
<div class="flex">
<div style="background: lightblue; width: 20px; grid-row: 4;" >
2
</div>
<div style="background: darkblue; width: 20px; height: 100px; grid-row: 3; transform: translateY(-50px);">
3
</div>
</div>
</div>
</body>
</html>