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chromium/third_party/blink/web_tests/external/wpt/trusted-types/trusted-types-duplicate-names-list-report-only.html 

<!DOCTYPE html>
<head>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
// We assume the following header has been set:
// Content-Security-Policy-Report-Only: trusted-types a b c
// (CSP-Report-Only headers can't be set in <meta> tags.)

test(t => {
  trustedTypes.createPolicy("a", {});
  trustedTypes.createPolicy("a", {});
  trustedTypes.createPolicy("b", {});
  trustedTypes.createPolicy("d", {});
}, "TrustedTypePolicyFactory and policy list in CSP.");

</script>
</body>