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chromium
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chromium/third_party/blink/web_tests/http/tests/xmlhttprequest/workers/referer.html 

<html>
<body>
<p>Referer should be set for XMLHttpRequest from Workers.</p>
<script src="resources/worker-create.js"></script>
<script src="resources/referer-test.js"></script>
</body>
</html>