Re: [w3c/webcomponents] [Shadow] Slotting indirect children (#574)

This was done for both performance and semantics reasons. Since each ancestor of a node can have its own shadow tree, we must define the shadow tree to which a node is assigned, and the latter turned out be tricky.  At the end, WebKit team at Apple has argued for supporting this feature but we couldn't reach a consensus to do so in v1.

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