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diff --git a/testing/web-platform/tests/webmessaging/without-ports/027.html b/testing/web-platform/tests/webmessaging/without-ports/027.html
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+<!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>