Re: [w3c/webcomponents] The get-the-parent algorithm shouldn't return null until we reach the root of the current tree (#577)

Ah, okay, then this issue is about step 6.3. having to read instead:
> Otherwise, if *parent* is *relatedTarget*'s root, then set *parent* to null.

Basically, we can't stop immediately when parent and relatedTarget match in a tree. Instead, we need to keep going it up until the root of that very tree.

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