Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/fast/workers/chromium/resources/worker-document-leak-iframe.html 

<!DOCTYPE html>
<html>
<body>
<script src="../../resources/worker-util.js"></script>
<script>
var worker = new Worker('empty-worker.js');
worker.onmessage = function(event) {
    waitUntilWorkerThreadsExit(function() {
        parent.postMessage("done", "*");
    });
};
</script>
</body>
</html>