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chromium/third_party/blink/web_tests/external/wpt/css/css-break/flexbox/single-line-column-flex-fragmentation-045.html 

<!DOCTYPE html>
<title>
  Single-line column flex fragmentation: column balancing with forced break
  w/ vertical writing-mode.
</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;
    background: green;
    block-size: 100px;
  }
  #flex > div {
    inline-size: 25px;
    background: green;
    flex: none;
  }
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="writing-mode: vertical-rl;">
  <div style="inline-size: 100px; block-size: 100px; background: red;">
    <div style="inline-size: 100px; columns: 4; column-gap: 0; position: relative;">
      <div id="flex">
        <div style="block-size: 5px;"></div>
        <div style="block-size: 10px; break-before: column;"></div>
        <div style="block-size: 5px;">
          <div style="block-size: 90px; inline-size: 25px; background: green;"></div>
        </div>
        <div style="block-size: 85px;"></div>
        <div style="block-size: 5px;"></div>
        <div style="block-size: 10px; break-before: column;"></div>
        <div style="block-size: 5px;">
          <div style="block-size: 90px; inline-size: 25px; background: green;"></div>
        </div>
      </div>
      <div style="position: absolute; right: 5px; top: 50px; block-size: 95px; inline-size: 25px; background: green;"></div>
    </div>
  </div>
</div>