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The WindowSize dictionary [1] uses the data type double for height/width but this isn't supported in JSON which only has a number type [2] (which may be extracted to an integer or float in the local end). (Furthermore ElementRect may use floats for the positioning of elements in the DOM, e.g. .5px, but WindowSize uses integers as no window managers support half pixels.) 1. https://dvcs.w3.org/hg/webdriver/raw-file/tip/webdriver-spec.html#dictionary-windowsize-members 2. http://www.ietf.org/rfc/rfc4627.txt
*** Bug 26704 has been marked as a duplicate of this bug. ***
This is because WebIDL does not have a number type so updating bug to what the real issue is