[uievents] Keyboard events should specify their target when more than 1 document exists (#52)

Copied from W3C Bugzilla: https://www.w3.org/Bugs/Public/show_bug.cgi?id=29136

##### Jeffrey Yasskin 2015-09-18 22:48:51 UTC
https://w3c.github.io/uievents/#event-type-keydown defines Event.target as "focused element processing the key event or if no element focused, then the body element if available, otherwise the root element". However, "the body element" and "the root element" aren't uniquely defined within a UA. The UA may have multiple browsing contexts, and each browsing context can contain multiple documents.


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https://github.com/w3c/uievents/issues/52