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<!DOCTYPE html>
<title>
  Multi-line column flex fragmentation with forced break and negative margin.
</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>
  .multicol {
    column-count: 5;
    column-fill: auto;
    column-gap: 0px;
    height: 100px;
    width: 100px;
    position: relative;
    background: red;
    z-index: -1;
  }
  #flex {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    height: 500px;
    position: relative;
  }
  #flex > div {
    background: green;
    width: 10px;
  }
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="multicol">
  <div id="flex">
    <div style="height: 150px;"></div>
    <div style="height: 350px; break-before: column; margin-top: -50px;"></div>
    <div style="height: 150px;"></div>
    <div style="height: 300px; break-before: column;"></div>
  </div>
  <div style="position: absolute; top: 50px; left: 20px; width: 20px; height: 50px; background: green;"></div>
  <div style="position: absolute; top: -50px; left: 40px; width: 10px; height: 50px; background: white;"></div>
</div>