Re: [webcomponents] Composition Algorithm shouldn't unwrap slots (#308)

> I'd like to treat a slot, as well as an insertion point, *as* `DocumentFragment`, as ShadowRoot actually is. That has been in my mental model for a long time. By *considering* both as `DocumentFragment`, everything became clear to me.

I don't understand what you mean by this. A slot element is an element so it certainly can't be a document fragment.

Moreover, as things stand, the concept of "slot" isn't well defined in the spec.  It's a "defined location" according to the spec but there are no definitions of "defined"-ness or what a "location" is.  It could be a (node, offset) pair like a [boundary point](http://www.w3.org/TR/dom/#concept-range-bp) or it could be a node.  Whatever it is, it needs to be precisely defined.  See issues #306 and #307.

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