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-rw-r--r--testing/web-platform/tests/webmessaging/with-ports/014.html17
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diff --git a/testing/web-platform/tests/webmessaging/with-ports/014.html b/testing/web-platform/tests/webmessaging/with-ports/014.html
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+++ b/testing/web-platform/tests/webmessaging/with-ports/014.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<title>structured clone vs reference</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+async_test(function(t) {
+ var x = [];
+ y = [x,x];
+ postMessage(y, '*', []);
+ onmessage = t.step_func(function(e) {
+ assert_equals(e.data[0], e.data[1], 'e.data[0] === e.data[1]');
+ assert_not_equals(e.data[0], x, 'e.data[0] !== x');
+ t.done();
+ });
+});
+</script>