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Test Info:

<!DOCTYPE html>
<title>
Single-line column flex fragmentation: Negative margins.
</title>
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<style>
#flex {
display: flex;
flex-direction: column;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="height: 100px; width: 100px; background: red; position: absolute">
<div style="margin-top: 150px; margin-left: -40px; width: 100px; height: 100px; columns: 5; column-gap: 0; column-fill: auto;">
<div id="flex">
<div style="height: 150px; width: 20px;"></div>
<div style="height: 100px; margin-top: -150px; width: 100px; break-before: column; background: green;"></div>
</div>
</div>
</div>