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+<html><head>
+<title>Test for bug 1308956</title>
+<link rel="stylesheet" href="/tests/SimpleTest/test.css">
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/EventUtils.js"></script>
+
+<body>
+ <script>
+
+var a = new MessageEvent("message")
+ok(!!a, "We have a MessageEvent");
+is(a.ports.length, 0, "By default MessageEvent.ports is an empty array");
+
+a.initMessageEvent("message", true, false, {}, window.location.href, "", null, []);
+ok(Array.isArray(a.ports), "After InitMessageEvent() we have an array");
+is(a.ports.length, 0, "Length is 0");
+
+var mc = new MessageChannel();
+a.initMessageEvent("message", true, false, {}, window.location.href, "", null, [mc.port1]);
+ok(Array.isArray(a.ports), "After InitMessageEvent() we have an array");
+is(a.ports.length, 1, "Length is 1");
+
+ </script>
+</body>
+</html>