Re: [dom] Factor getElementsBy* into ParentNode or NonElementParentNode? (#68)

I guess I feel that it will be more confusing for authors *not* to find these APIs on Shadow roots in the future. As more and more authors adopt a component model design, the shadow root object becomes a stand-in for the traditional document object as far as a place to execute node searches. And with getElementById and querySelector available, but not the others, it will look like a spec oversight/bug in implementations.

I suppose I'm just echoing [this sentiment](http://lists.w3.org/Archives/Public/public-whatwg-archive/2013Oct/0102.html).

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