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chromium/third_party/blink/web_tests/external/wpt/workers/semantics/multiple-workers/001.html 

<!doctype html>
<title>dedicated and shared worker in same page</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
async_test(function() {
  var worker = new Worker('001.js');
  worker.onmessage = this.step_func(function(e) {
    assert_equals(e.data, 'dedicated');
    this.done();
  });
  worker.postMessage('dedicated');
}, 'dedicated');
async_test(function() {
  var shared = new SharedWorker('001.js', '');
  shared.port.onmessage = this.step_func(function(e) {
    assert_equals(e.data, 'shared');
    this.done();
  });
  shared.port.postMessage('shared');
}, 'shared');
</script>