File: worker.html

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<!DOCTYPE html>
<meta charset=utf-8>
<link rel="help" href="https://html.spec.whatwg.org/multipage/comms.html#messageevent">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>

async_test(t => {
  function workerCode() {
    close();
    var mc = new MessageChannel();
    mc.port1.postMessage(42);
    mc.port2.postMessage(42);
    postMessage(true);
  }

  var workerBlob = new Blob([workerCode.toString() + ";workerCode();"], {type:"application/javascript"});

  var w = new Worker(URL.createObjectURL(workerBlob));
  w.onmessage = function(e) {
    assert_true(e.data, "MessageChannel created on worker shutdown.");
    t.done();
  }
}, 'MessageChannel/MessagePort created and used after a worker self.close()');

</script>