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chromium/third_party/blink/web_tests/external/wpt/css/css-page/page-margin-auto-and-non-zero-print-ref.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<style>
  @page {
    size: 20em 7em;
    margin: 0;
  }
  .pagebox {
    break-before: page;
    display: flex;
    width: 20em;
    height: 7em;
  }
  .pagebox > div {
    flex: 1;
    margin: 30px;
    border: solid;
    background: yellow;
  }
  body {
    margin: 0;
  }
</style>
<div class="pagebox">
  <div>center / middle</div>
</div>
<div class="pagebox">
  <div style="margin-top:0;">center / top</div>
</div>
<div class="pagebox">
  <div style="margin-bottom:0;">center / bottom</div>
</div>
<div class="pagebox">
  <div style="margin-top:0; margin-left:0;">top / left</div>
</div>
<div class="pagebox">
  <div style="margin-top:0; margin-right:0;">top / right</div>
</div>
<div class="pagebox">
  <div style="margin-bottom:0; margin-right:0;">bottom / right</div>
</div>