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chromium/third_party/blink/web_tests/external/wpt/css/css-page/page-size-001-print.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://www.w3.org/TR/css-page-3/#page-size-prop">
<link rel="match" href="page-size-001-print-ref.html">
<style>
  @page { size: 300px 400px; }
  body { margin: 0; }
</style>
<div style="break-before:page;">Page 1</div>
<div style="break-before:page;">Page 2</div>
<div style="break-before:page;">Page 3</div>