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<!DOCTYPE html>
<html>
<style>
html, body {
font: 15px/1 monospace;
margin: 0;
}
.grid {
display: grid;
grid-template-columns: repeat(4, 100px);
gap: 20px;
}
</style>
<body>
<p>Ensure that dense-packing honors flow-tolerance. An item may be packed into an earlier-in-flow track whose running position is within the flow-tolerance of the highest eligible opening. The second pink item (Item 4a) should stack under Item 1 in the first column, not in the last column.</p>
<div class="grid">
<div style="background: lightblue; height: 90px; grid-column: 1; grid-row: 1;">Item 1</div>
<div style="background: lightgreen; height: 180px; grid-column: 2; grid-row: 1;">Item 2</div>
<div style="background: lightgray; height: 80px; grid-column: 3; grid-row: 1;">Item 3</div>
<div style="background: pink; height: 70px; grid-column: 4; grid-row: 1;">Item 4</div>
<div style="background: pink; height: 70px; grid-column: 1; grid-row: 1; transform: translateY(110px);">Item 4a</div>
<div style="background: yellow; height: 15px; grid-column: 3; grid-row: 1; transform: translateY(100px);">Item 5</div>
</div>
</body>
</html>