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chromium/third_party/blink/web_tests/wpt_internal/geolocation-api/resources/disconnected-frame-inner.html 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
  <head>
  </head>
  <body onload="window.parent.onIframeLoaded()", onpagehide="window.parent.onIframePageHidden();">
    <p>This frame should be replaced before the test ends</p>
  </body>
</html>