Re: [webcomponents] Replace attached/detached callbacks with insertedIntoDocument/removedFromDocument (#362)

That is what I'm suggesting, but maybe it is not necessary for a custom element to get that much context? I believe that is what browsers have internally, but I don't know offhand the nodes that require that information. There's a potential problem with that too, e.g., if _newAncestor_ is inside a closed shadow tree we should probably not pass it…

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