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chromium/third_party/blink/web_tests/external/wpt/html/browsers/windows/nested-browsing-contexts/resources/frameElement-nested-frame.html 

<!DOCTYPE html>
<meta charset="utf-8"/>
<title>HTML Test: child browsing context created by the frame element</title>
<link rel="author" title="Intel" href="http://www.intel.com/" />
<frameset>
  <frame id="f1" name="frame">
</frameset>