chromium/third_party/blink/web_tests/fast/workers/worker-event-listener.html

<body>
<p>Test EventTarget methods on workers. Should print "SUCCESS".</p>
<div id=result></div>
<script src="../../resources/gc.js"></script>
<script>
function log(message)
{
    document.getElementById("result").innerHTML += message + "<br>";
}

if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}

var worker = new Worker('resources/worker-event-listener.js');
worker.postMessage("");
worker.onmessage = function(evt) {
    log(evt.data);
    if (window.testRunner)
        testRunner.notifyDone();
    
}
gc();
</script>
</body>
</html>