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chromium/third_party/blink/web_tests/external/wpt/workers/interfaces/WorkerUtils/WindowTimers/002.html 

<!doctype html>
<title>clearTimeout</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('002.js');
  var gotMessage = false;
  worker.onmessage = function() { gotMessage = true; };
  setTimeout(this.step_func(function() { assert_false(gotMessage); this.done(); }), 100);
});
</script>