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chromium/third_party/blink/web_tests/external/wpt/workers/interfaces/SharedWorkerGlobalScope/onconnect.html 

<!doctype html>
<title>onconnect</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
async_test(function() {
  var w1 = new SharedWorker('onconnect.js', '');
  w1.port.addEventListener('message', this.step_func(function(e) {
    assert_array_equals(e.data, ['null', 'null', 'function', '']);
  }), false);
  w1.port.start();
});
</script>