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chromium/third_party/blink/web_tests/external/wpt/webmessaging/with-ports/021.html 

<!doctype html>
<title>cross-origin test</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe src="../without-ports/020-1.html"></iframe>
<div id="log"></div>
<script>
setup({ single_test: true });

var iframe = document.createElement('iframe');
var url_prefix = location.href.replace('://', '://www1.').replace(/\/with(out)?-ports\/[^\/]+$/, '');
var url = url_prefix + '/without-ports/020-1.html';
iframe.src = url;
document.body.appendChild(iframe);
</script>
<div id=log></div>
<script>
onload = function() {
  window[0].postMessage(1, '*', []);
  window[1].postMessage(2, '*', []);
  var i = 0;
  onmessage = function(e) {
    i++;
    assert_equals(e.data[0], i);
    assert_equals(e.data[1], location.protocol + '//' + location.host);
    if (i === 2) {
      done();
    }
  };
};
</script>