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chromium/third_party/blink/web_tests/external/wpt/html/browsers/history/the-location-interface/resources/iframe-with-iframe.html 

<!DOCTYPE HTML>
<html>
  <head>
    <title>Resource file for test of Referer with location.replace and location.assign</title>
  </head>
  <body>
    <iframe src="iframe-postmessage-to-parent-parent.sub.html"></iframe>
  </body>
</html>