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chromium/third_party/blink/manual_tests/print-iframe-containing-fixed.html 

<!DOCTYPE html>
<iframe id='iframe' style="width: 100%; border: none" srcdoc="
  <div style='position: fixed; border: 20px solid black; right: 0'>
    <div id='div'>Select some text and print. Border should not disappear.</div>
  </div>">
</iframe>