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chromium/third_party/blink/web_tests/fast/files/workers/resources/worker-read-blob-async-crash-iframe.html 

<!DOCTYPE html>
<html>
<body>
<script>
var worker = new Worker('worker-read-blob-async-crash.js');
worker.addEventListener('message', function(e) {
  location.href = 'about:blank';
}, false);
worker.postMessage({});
</script>
</body>
</html>