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chromium/third_party/blink/web_tests/external/wpt/css/css-page/page-margin-004-print-ref.html 

<!DOCTYPE html>
<title>CSS Test Reference</title>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<style>
  @page {
    size: 300px;
    margin: 10px 20px 30px 40px;
  }
  body {
    margin: 0;
  }
</style>
<div style="border:10px solid; background:yellow;">
  <div style="height:250px;">Page 1</div>
  <div style="background:cyan;">
    Page 2
  </div>
</div>