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<!DOCTYPE html>
<html>
<style>
.grid {
display: grid;
grid-auto-flow: dense;
grid-template-columns: repeat(4, 50px); width: 170px;
}
</style>
<body>
<p>Ensure that dense-packing correctly iterates through all possible track openings to find an opening span. Item that should be placed into opening is yellow.</p>
<div class="grid"">
<div style="background: aquamarine; height: 60px; grid-column: 4;" >
1
</div>
<div style="background: blue; height: 40px; grid-column: 3;" >
2
</div>
<div style="background: blueviolet; height: 20px; grid-column: 2;">
3
</div>
<div style="background: lightsteelblue; height: 60px; grid-column: 1;">
6
</div>
<div style="background: lightblue; height: 10px; grid-column: 3 / span 2;">
4
</div>
<div style="background: lightskyblue; grid-column: 1; height: 30px; grid-column: 4;">
5
</div>
<div style="background: aqua; height: 20px; grid-column: span 4;">
7
</div>
<div style="background: yellow; height: 10px; grid-column: span 3;">
8
</div>
</div>
</body>
</html>