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chromium/chrome/test/data/extensions/declarative_net_request/cross_site_script.html 

<html>
  <!-- This only works if the CrossSiteRedirector is running on the embedded
       test server, and the host_resolver is set up to handle b.com. -->
  <script src="/cross-site/b.com/subresources/not_a_valid_script.js"></script>
</html>