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chromium/third_party/blink/web_tests/external/wpt/css/css-page/page-box-006-print-ref.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<style>
  @page {
    size: 400px;
    margin: 0;
  }
  body {
    margin: 0;
  }
</style>
<div style="margin:50px; height:300px; background:yellow;">
  Yellow background, white page margins.
</div>
<div style="display:flow-root; break-before:page; height:400px; background:blue;">
  <div style="margin:50px; height:300px; background:yellow;">
    Yellow background, blue page margins.
  </div>
</div>