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

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<style>
  @page {
    size: 320px 200px;
    margin: 0;
  }
  @page :first {
    size: 500px;
  }
  body {
    margin: 0;
  }
</style>
<div style="width:250px; height:500px; background:yellow;">
  first page
</div>
<div style="break-before:page; width:160px; height:200px; background:cyan;">
  second page
</div>
<div style="break-before:page; width:160px; height:200px; background:pink;">
  third page
</div>