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chromium/chrome/test/data/safe_browsing/download_protection/navigation_observer/navigation_observer_multi_frame_tests.html 

<html>
  <head>
  </head>
  <body>
    <iframe id="iframe1" src="iframe.html"></iframe><br>
    <iframe id="iframe2" src="iframe_retargeting.html"></iframe>
  </body>
</html>