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<!DOCTYPE html>
<html>
<style>
.grid {
    display: grid;
    grid-template-columns: repeat(4, 50px);
}
.upwards {
    transform: translateY(-20px);
}
</style>
<body>
  <p>Ensure that dense-packing in masonry only places items with a specified track into track openings in that same specified track.</p>
  <div class="grid">
    <div style="background: brown; height: 20px;"></div>
    <div style="background: brown; height: 40px; grid-column: 2;"></div>
    <div style="background: pink; height: 20px; grid-column-start: 3;"></div>
    <div style="background: brown; height: 60px; grid-column-start: 4;"></div>
    <div class="upwards" style="background: brown; height: 20px; grid-column: span 2;"></div>
    <div class="upwards" style="background: brown; height: 20px; grid-column: span 4;"></div>
    <div class="upwards" style="background: brown; height: 20px; grid-column: span 3;"></div>
    <div class="upwards" style="background: yellow; height: 20px; grid-column-start: 4;"></div>
    <div class="upwards" style="background: brown; height: 20px; grid-column: span 4;"></div>
  </div>
</body>
</html>