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chromium/third_party/blink/web_tests/external/wpt/workers/semantics/multiple-workers/003.html 

<!doctype html>
<title>creating 3 nested dedicated workers</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
async_test(function() {
  var w1 = new Worker('003.js#1');
  w1.onmessage = this.step_func(function(e) {
    assert_equals(e.data, '123');
    this.done();
  });
  w1.onerror = this.unreached_func("error");
});
</script>