Re: [w3c/manifest] Tidy up the install event specification (#473)

> It doesn't explicitly state the type/interface of the event object (which I assume is Event because there's no special metadata).

Correct. Will clarify. 

> 2...  Bascially, you can figure out what's going on from reading the example, but I feel it isn't concrete in the spec, the way events in Service Workers spec are defined.

Will clarify based on how SW does it. 

> to extend the Window object without it having to implement a new interface?

Having it as a mixin gives us the ability to potentially mixit in elsewhere - however,  I don't have a strong opinion. I currently have it implemented as a mixin in Gecko. 

@domenic, does it make a big difference if it's defined as new Interface or would it be better to just use a partial interface? 



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