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Recently window-manipulation methods like "setWindowSize" have been modified and tell that they do operations with "window currently in focus". But "switchToWindow" uses another wording - "window used as the context for processing commands". Those wordings are not the same and thus it may be not crystal clear that "switchToWindow" should change focus that is used in methods like "setWindowSize"/"getWindowSize"/etc. I think so becuase of this bug in Chromedriver - https://code.google.com/p/chromedriver/issues/detail?id=769