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When doing XHR/EventSource/importScript fetches from a Worker or SharedWorker, the referrer shouldn't be some document, but rather the URL of the worker itself. Same thing if a worker creates a sub worker. This is similar to how the referrer of a background image linked to from a CSS stylesheet is the URL of the stylesheet, not the URL of a html Document.
http://html5.org/tools/web-apps-tracker?from=7340&to=7341