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I'll add a post to technologies for which this could be a use case but which have not made it. Some of these look like they could have been very helpful. Foreign Fetch allowed a service worker to fetch pages on behalf of others. This experiment was removed from browsers in 2017. In 2014 University College, Google, Chalmers, and Mozilla Research developed a ...


I can see two options here. The first is to just delegate the crypto part to a server, and communicate with it via a HTTP API. This wouldn't involve the JS web crypto API, and perhaps it would violate some of your design criteria. Second option for communicating across origins is Window.postMessage(). It let's you send messages and receive responses ...

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