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

<!doctype html>
<style>
  body { margin: 0 }
  p {
    /* 2 times the default margin of <body>, to account for the doubly-nested document */
    margin: 16px;
  }
</style>
<p>PASS