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chromium/third_party/blink/web_tests/external/wpt/css/css-page/page-margin-auto-print.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-page-3/#page-properties">
<link rel="match" href="page-margin-auto-print-ref.html">
<style>
  @page {
    size: 20em 7em;
    width: 12em;
    height: 3em;
    margin: auto;
  }
  @page aaa { }
  @page bbb {
    margin-top: 0;
  }
  @page ccc {
    margin-bottom: 0;
  }
  @page ddd {
    margin-top: 0;
    margin-left: 0;
  }
  @page eee {
    margin-top: 0;
    margin-right: 0;
  }
  @page fff {
    margin-bottom: 0;
    margin-right: 0;
  }
  body {
    margin: 0;
    background: yellow;
  }
</style>
<div style="page:aaa;">
  center / middle
</div>
<div style="page:bbb;">
  center / top
</div>
<div style="page:ccc;">
  center / bottom
</div>
<div style="page:ddd;">
  top / left
</div>
<div style="page:eee;">
  top / right
</div>
<div style="page:fff;">
  bottom / right
</div>