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<!DOCTYPE html>
<html>
<style>
.grid {
    display: grid;
    grid-template-rows: 10px 10px 20px 15px 5px;
    grid-auto-flow: column;
}
.flex {
    display: flex;
    flex-direction: row;
}
</style>
<body>
  <p>Ensure that dense-packing with multi-span items are placed into tracks with the same used size and the same number of tracks, and priority is given to tracks closest after the auto-placement cursor.</p>
  <div class="grid">
    <div class="flex">
      <div style="background: yellow; width: 20px; height: 20px;" >
        4
      </div>
      <div style="background: lightblue; width: 20px; height: 60px;" >
        2
      </div>
      <div style="background: darkblue; width: 20px; height: 40px;">
        3
      </div>
    </div>
    <div style="background: lightskyblue; width: 20px; height: 20px; transform: translateY(10px);" >
      1
    </div>
  </div>
</body>
</html>