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The use cases includes this phrase: "the rise of WebSockets and RTCWEB allows" I could be wrong, but this would make more sense to me if worded as WebRTC. From what I can tell, RTCWEB is the name of the IETF working group, whereas WebRTC is name of the browser technology and W3C working group: http://www.w3.org/TR/webrtc/
Moved to https://github.com/w3c/webcrypto/issues/47