[whatwg] Node inDocument

[James Graham]

On 08/30/2011 10:44 AM, Anne van Kesteren wrote:
> On Tue, 30 Aug 2011 10:38:19 +0200, Jonas Sicking <jonas at sicking.cc> wrote:
>> In general I think it's better to have functions that deal with child
>> lists on Node rather than on Element/Document/DocumentFragment.
>>
>> I think it might still make sense to have inDocument though. That'll
>> allow people to more clearly express what they are actually trying to
>> do, while allowing implementations to write faster code.
>
> If we are going to have Node.contains implementations surely could
> optimize document.contains(node) which seems as clear as node.inDocument
> to me.

They are different in the case of multiple documents though. Which 
solution makes sense given the use cases? What are the use cases?