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chromium/third_party/blink/web_tests/fast/filesystem/workers/resources/detached-frame-crash-frame.html 

<!DOCTYPE html>
<script>
var worker = new Worker("detached-frame-crash-worker.js");
worker.addEventListener("message", relayMessage);

function relayMessage(event)
{
    parent.postMessage(event.data, location.origin);
}
</script>