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https://dvcs.w3.org/hg/webdriver/raw-file/tip/webdriver-spec.html#naming-the-two-sides-of-the-api There is no requirement that the local and remote ends be in different processes. The IDL given in this specification and summarized in Appendix XXXX SHOULD be used as the basis for any conforming local end implementation. EXPECT: Appendix XXXX should be a real appendix
landed in https://dvcs.w3.org/hg/webdriver/rev/43244f22f4ab