no-report-on-subdomain-404.https.html

<!DOCTYPE HTML>
<html>
<head>
  <title>
    Test that include_subdomains policies do NOT report HTTP errors
  </title>
  <script src='/resources/testharness.js'></script>
  <script src='/resources/testharnessreport.js'></script>
  <script src='./support/nel.sub.js'></script>
</head>
<body>
  <script>
    nel_test(async t => {
      // Make a request to a resource whose response headers include an
      // include_subdomains NEL policy.
      await fetchResourceWithIncludeSubdomainsPolicy();
      // Make a request to another resource on a subdomain of the above.  This
      // resource doesn't exist, so the server should return a 404.
      await fetchMissingResource('www');
      // The include_subdomains policy that we just received should NOT cover
      // the second request, since include_subdomains policies can only report
      // on DNS errors.
      assert_false(await reportExists({
        url: getURLForMissingResource('www'),
        type: "network-error",
      }));
    });
  </script>
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/network-error-logging/no-report-on-subdomain-404.https.html