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chromium/third_party/blink/web_tests/external/wpt/css/css-page/page-name-flex-004-print.html 

<!DOCTYPE html>
<html>
  <link rel="match" href="page-name-flex-004-print-ref.html"/>
  <link rel="help" href="https://www.w3.org/TR/css-page-3/#using-named-pages"/>
  <body>
    <div>a</div>
    <div style="display:flex; flex-direction:column">
      <div>
        <div>
          <div style="page:a">b</div>
          <div style="page:b">c</div>
        </div>
      </div>
    </div>
    <div>d</div>
  </body>
</html>