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