Re: [webcomponents] Consider making ShadowRoot directly inherit from Node (#325)

I think inheritance is the proper relationship here. Every context where you can use a document fragment, you can use a shadow root, right? That (LSP) is the best criterion here. 

Inheritance does not mean that everywhere a subclass can appear, the superclass must also be able to appear. (So a shadow root being able to appear in documents even though a document fragment cannot is fine.) 

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