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<!DOCTYPE html>
<html>
<style>
.grid {
    display: grid;
    background: gray;
    position: relative;
    grid-template-rows: repeat(3, 50px);
    grid-auto-flow: dense;
}
.flex {
    display: flex;
    flex-direction: row;
}
</style>
<body>
  <p>Ensure that dense-packing does not affect the layout when all items are single-spanning.</p>
  <div class="grid">
    <div class="flex">
      <div style="background: lightskyblue; width: 20px;" >
        1
      </div>
      <div style="background: brown; width: 10px;">
        4
      </div>
      <div style="background: red; width: 40px;">
        5
      </div>
    </div>
    <div class="flex">
      <div style="background: lightcoral; width: 60px;" >
        2
      </div>
      <div style="background: pink; width: 40px;">
        6
      </div>
    </div>
    <div class="flex">
      <div style="background: lightgreen; width: 60px;">
        3
      </div>
      <div style="background: yellow; width: 40px;">
        7
      </div>
    </div>
  </div>
</body>
</html>