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chromium
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chromium/chrome/test/data/extensions/api_test/management/install_replacement_web_app/acceptable_web_app/index.html 

<html>
  <head>
    <title>Installable web app</title>
    <link rel="manifest" href="manifest.json"></link>
  </head>
  <body>
    Do-nothing page with a manifest.
  </body>
</html>