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chromium/third_party/blink/web_tests/external/wpt/workers/interfaces/DedicatedWorkerGlobalScope/postMessage/event-ports-dedicated.html 

<!doctype html>
<title>e.ports in dedicated worker</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
(async_test()).step(function() {
  var worker = new Worker('event-ports-dedicated.js');
  worker.postMessage(1);
  worker.onmessage = this.step_func(function(e) {
    assert_true(e.data);
    this.done();
  });
});
</script>