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<!DOCTYPE html>
<html>
<style>
.grid {
    display: grid;
    grid-template-columns: repeat(4, 50px);
    width: 170px;
    grid-auto-flow: dense;
}
</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;" >
      1
    </div>
    <div style="background: blue; height: 40px;" >
      2
    </div>
    <div style="background: blueviolet; height: 20px;">
      3
    </div>
    <div style="background: lightblue; height: 10px; grid-column: 1 / span 2;">
      4
    </div>
    <div style="background: lightskyblue; grid-column: 1; height: 30px;">
      5
    </div>
    <div style="background: lightsteelblue; height: 60px; grid-column: 4;">
      6
    </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>