<html><head> <title>Test for bug 1308956</title> <link rel="stylesheet" href="/tests/SimpleTest/test.css"> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <script type="text/javascript" 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>