Figuring out the behavior of WindowProxy in the face of non-configurable properties

[Boris Zbarsky]

On 1/14/15 5:58 PM, Travis Leithead wrote:
> The other challenge that just came to mind, is the
> document object—at least in Gecko and IE: a document.write call will
> “re-init” the object (subbing out the old var for a new one)

What Gecko does on document.open is just create a new Window, just like 
navigation.  This part is actually pretty clearly defined in the HTML spec.

-Boris