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chromium/third_party/blink/web_tests/fast/frames/frameset-frameborder-dynamic-expected.html 

<!DOCTYPE html>
<html>
<frameset cols="50%,*" rows="50%,*" border="10">
  <frame frameborder="1"></frame>
  <frame frameborder="1"></frame>
  <frame frameborder="1"></frame>
  <frameset><frame frameborder="1"></frame></frameset>
</frameset>
</html>