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chromium/third_party/blink/web_tests/http/tests/workers/shared-worker-performance-timeline.html 

<!doctype html>
<title>Test Performance APIs in Shared Worker</title>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script>
fetch_tests_from_worker(
  new SharedWorker('resources/performance-timeline-worker.js'));
</script>