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chromium/third_party/blink/web_tests/external/wpt/webmessaging/without-ports/027.html 

<!doctype html>
<title>Cloning objects, preserving sharing</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
async_test(function() {
  var obj1 = {o: 1};
  var obj2 = {d: obj1};
  var obj3 = {d: obj1};
  var obj_dag = {b: obj2, c: obj3};

  postMessage(obj_dag, '*');
  onmessage = this.step_func(function(e) {
    assert_equals(e.data.b.d, e.data.c.d);
    this.done();
  });
});
</script>