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<!DOCTYPE html>
<title>
  Multi-line column flex fragmentation: Negative margins.
</title>
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#pagination">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<style>
  #flex {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    height: 500px;
  }
  #flex > div {
    height: 100px;
    width: 10px;
  }
  #flex > div:nth-child(odd) {
    background: green;
    margin-top: -100px;
    break-before: 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="position: absolute; left: 10px; width: 10px; height: 100px; background: green;"></div>
  <div style="margin-top: 100px; width: 100px; height: 100px; columns: 5; column-gap: 0; column-fill: auto;">
    <div id="flex">
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div style="background: white;"></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
    </div>
  </div>
</div>