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Test Info:

<!DOCTYPE html>
<title>
Single-line row flex fragmentation: Negative margins.
</title>
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<style>
#flex {
display: flex;
}
#flex > div {
width: 25px;
background: green;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="width: 100px; height: 100px; columns: 2; column-gap: 0; column-fill: auto; position: relative; background: red;">
<div id="flex">
<div style="height: 200px;"></div>
<div style="height: 210px; margin-top: -10px; break-before: column;"></div>
</div>
<div style="position: absolute; height: 10px; width: 25px; top: -10px; left: 25px; background: white;"></div>
</div>