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Test Info:

<!DOCTYPE html>
<title>
Multi-line column flex fragmentation: we shouldn't insert a forced break if
there's no preceding content at the start of a fragmentainer.
</title>
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<style>
.multicol {
column-count: 2;
column-fill: auto;
column-gap: 0px;
height: 100px;
width: 100px;
position: relative;
background: red;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="multicol">
<div style="display: flex; flex-direction: column; flex-wrap: wrap; width: 50px; height: 200px;">
<div style="height: 100px; width: 25px; break-before: column; background: green;"></div>
<div style="height: 100px; width: 25px; break-before: column; background: green;"></div>
<div style="height: 50px; width: 25px; break-before: column; background: green;"></div>
<div style="height: 150px; width: 25px; background: green;"></div>
</div>
</div>