Re: [whatwg/dom] Composed tree infrastructure (#725)

In the past, the Shadow DOM specification had a concept of *composed tree*, defined as *a tree of trees*, however, I remember we haven't migrated this concept into DOM Standard
because we've found that definitions of *shadow-including xxx* (e.g. shadow-including ancestor) are good enough.

I guess we don't need a full concept of a *composed tree* any more. What we need here is a *composed-parent* or something for title attribute or bidi?

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