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chromium/third_party/blink/web_tests/external/wpt/css/css-page/page-size-004-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/#at-page-rule">
<link rel="match" href="page-size-004-print-ref.html">
<style>
  @page {
    size: 320px 200px;
    margin: 0;
  }
  @page :first {
    size: 100px;
  }
  body {
    margin: 0;
  }
</style>
<div style="width:50%; height:100px; background:yellow;">
  first page
</div>
<div style="width:50%; height:200px; background:cyan;">
  second page
</div>
<div style="width:50%; height:200px; background:pink;">
  third page
</div>