<!DOCTYPE html>
<title>
  Flex container fragmentation with tall margin.
</title>
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#pagination">
<link rel="match" href="../../reference/ref-filled-green-100px-square-only.html">
<style>
  .multicol {
    column-count: 4;
    column-gap: 0px;
    height: 100px;
    margin-left: -25px;
    width: 100px;
  }
  .flex {
    background: green;
    display: flex;
    height: 400px;
    margin-top: 200px;
    width: 25px;
  }
</style>
<p>Test passes if there is a filled green square.</p>
<div class="multicol">
  <div class="flex"></div>
</div>
