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chromium/third_party/blink/web_tests/http/tests/origin_trials/third-party-injected-classic-script-on-demand.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Test that trial is enabled by third-party token, injected on demand</title>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script src="resources/origintrials.js"></script>
<script src="http://localhost:8000/origin_trials/resources/inject-third-party-token-on-demand.js"></script>
<script>
promise_test(async t => {
  // The trial is not enabled, as no token is provided.
  await expect_failure_third_party();

  // Simulate initializing a third-party library, which then injects the
  // third-party token. The initThirdParty() function is provied by the
  // script, inject-third-party-token-on-demand.js
  initThirdParty();

  // The trial is now enabled, by the third-party token added.
  expect_success_third_party();
});
</script>