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1.2 says: Let LAST-VISITED-SHADOW-ROOT be the youngest shadow root which SHADOW-HOST hosts. but the first step in 3.1 says: Let LAST-VISITED-SHADOW-ROOT be SHADOW-ROOT. which has the same effect. I don't think you need step 1.2 at all. If you just need to initialize that variable then perhaps initialize it to null?
Looks like this is obsolete? I don't see the statements Elliott raised in the tip-of-tree specification.