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chromium/third_party/blink/web_tests/external/wpt/html/browsers/windows/iframe-nested-print.html 

<!doctype html>
<link rel=match href="iframe-nested-print-ref.html">
<style>
  body { margin: 0 }
</style>
<iframe frameborder=0 scrolling=no srcdoc="<iframe scrolling=no frameborder=0 srcdoc='PASS'></iframe>"></iframe>