Re: [whatwg/dom] compareDocumentPosition with Attr nodes still not quite right (#309)

The TreatShadowTreesAsComposed case is only used for an internal call site, from scripts one will get TreatShadowTreesAsDisconnected which (presumably) maintains the old behavior.

Still might be worthwhile adding a note about this or at the very least making sure there's something in web-platform-tests ensuring that everyone agrees on how to handle ShadowRoots.

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