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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo
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<!DOCTYPE html>
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<title> postMessage(): target port and source port </title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<div id=log></div>
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<script>
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async_test(function(t) {
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var channel = new MessageChannel();
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var source = channel.port1;
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var target = channel.port2;
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target.start();
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target.addEventListener("message", t.step_func_done(function(e) {
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assert_equals(e.target, target);
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assert_not_equals(e.target, source);
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}), true);
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source.postMessage("ping");
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});
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</script>
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