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

<!DOCTYPE html>
<html>
  <title>CSS page name change and break-before: page in a nested frame.</title>
  <link rel="author" title="Emily McDonough" href="mailto:[email protected]"/>
  <link rel="match" href="page-name-and-break-print-ref.html"/>
  <link rel="help" href="https://drafts.csswg.org/css-page-3/#page-breaks"/>
  <meta name="assert" content="Ensure CSS page name change and break-before: page at the same point only causes one page break."/>
  <body>
    <div style="page: a">AAA</div>
    <div style="page: b">
      <div style="break-before: page">BBB</div>
    </div>
  </body>
</html>