Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/http/tests/navigation/resources/page-treated-as-unreachable.html 

<html>
  <head>
    <title>This page will be initially treated as unreachable</title>
  </head>
  <body>
    <p>PASS: Going back to a page that was previously treated as unreachable loads the actual page.</p>
  </body>
</html>