Re: [webcomponents] Difference between composed document and document flat tree (#382)

Yeah, I agree. Let me think about it again.

Since it looks Shadow DOM should *work* in a shadow tree which is *disconnected* from a document, my preference is:

1. `composed tree (of component trees (or node trees))`
   I don't have a strong opinion. I'm fine with `composed tree`. This terminology is not used frequently, I think.

2. `composed {parent/child/...}`
  I am fine with the current naming, `composed XXX`. It might be okay to rename it to `deep XXX`.

3. `component tree`
  We can define it as either a `document tree` or a `shadow tree`.

4. `fragment tree` and `primary component tree`.
  Remove it

5. The usage of `component tree` in the current spec
  We can replace most of them with `node tree`.

7. `flat tree`
  I'm fine with it. 



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