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chromium/third_party/blink/web_tests/external/wpt/css/css-page/margin-boxes/dimensions-001-print-ref.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<style>
  @page {
    margin: 0;
    size: 500px 400px;
  }
  body {
    margin: 0;
  }
</style>
<div style="display:flex; margin:0 100px; height:100px; align-items:flex-end;">
  <div style="border:solid; width:20%; height:20%;">20%</div>
</div>
<div style="display:flex; height:200px;">
  <div style="display:flex; width:100px;">
    <div style="flex:1; border:solid;">
      auto
    </div>
  </div>
  <div style="flex:1;"></div>
  <div style="display:flex; width:100px;">
    <div style="width:70%; height:70%; margin:auto 0; border:solid;">
      70%
    </div>
  </div>
</div>
<div style="margin:0 100px; height:94px; border:solid;">auto</div>