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chromium/third_party/blink/web_tests/external/wpt/css/css-page/page-box-005-print-ref.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<style>
  @page {
    size: 400px;
    margin: 0;
  }
  body {
    margin: 0;
  }
  .pagebox {
    display: flex;
    break-before: page;
    height: 400px;
  }
  .pagearea {
    margin: 50px;
    border: 10px dotted;
    padding: 20px;
  }
</style>
<div class="pagebox">
  <div class="pagearea" style="border-color:orange;">
    White background (including page margins). Orange dotted border. Black text.
  </div>
</div>
<div class="pagebox" style="background:yellow;">
  <div class="pagearea" style="border-color:hotpink;">
    Yellow background (including page margins). Hotpink dotted border. Black text.
  </div>
</div>
<div class="pagebox" style="background:cyan;">
  <div class="pagearea">
    Cyan background (including page margins). Black dotted border. Black text.
  </div>
</div>