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chromium/third_party/blink/web_tests/external/wpt/service-workers/service-worker/ServiceWorkerGlobalScope/extendable-message-event-constructor.https.html 

<!DOCTYPE html>
<title>ServiceWorkerGlobalScope: ExtendableMessageEvent Constructor</title>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script src='../resources/test-helpers.sub.js'></script>
<script>
service_worker_test(
    'resources/extendable-message-event-constructor-worker.js', document.title
  );
</script>