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chromium/third_party/blink/web_tests/external/wpt/css/css-break/flexbox/single-line-column-flex-fragmentation-012.html 

<!DOCTYPE html>
<title>
  Tests that flex-items get pushed down due to a previous multicol flex-item
  expanding as a result of fragmentation.
</title>
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#pagination">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<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; background: red;">
  <div style="display: flex; flex-direction: column;">
    <div style="width: 50px; columns: 2; column-gap: 0; column-fill: auto; background: green;">
      <div style="width: 50px; height: 160px;"></div>
      <div style="column-span: all; height: 30px; break-inside: avoid;"></div>
    </div>
    <div style="background: green; height: 50px;"></div>
    <div style="background: green; height: 20px;"></div>
  </div>
</div>