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chromium/third_party/blink/web_tests/external/wpt/webmessaging/with-ports/019.html 

<!doctype html>
<title>origin of the script that invoked the method, scheme/host/port</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe src="../without-ports/019-1.html"></iframe>
<div id=log></div>
<script>
async_test(function(test) {
  onload = test.step_func(function() {
    window[0].postMessage('', location.protocol.toUpperCase() + '//' + location.host.toUpperCase() + '/', []);
    window[0].onmessage = test.step_func(function(e) {
      assert_equals(e.origin, location.protocol + '//' + location.host);
      assert_array_equals(e.ports, []);
      test.done();
    });
  });
});
</script>