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The following endpoints include a window_handle: POST /session/{sessionId}/window/{windowHandle}/size GET /session/{sessionId}/window/{windowHandle}/size POST /session/{sessionId}/window/{windowHandle}/maximize But we had previously decided these commands should only operate on the current window (https://www.w3.org/Bugs/Public/show_bug.cgi?id=24987) so the handle is meaningless.
https://dvcs.w3.org/hg/webdriver/rev/cefd47df0817