Re: [whatwg/dom] Steps of removing a node definition about live range do not match with browsers if the range is in a shadow DOM and the shadow itself is removed (Issue #1274)

> An inclusive descendant is an object or one of its [descendants](https://dom.spec.whatwg.org/#concept-tree-descendant).
> An object A is called a descendant of an object B, if either A is a [child](https://dom.spec.whatwg.org/#concept-tree-child) of B or A is a [child](https://dom.spec.whatwg.org/#concept-tree-child) of an object C that is a [descendant](https://dom.spec.whatwg.org/#concept-tree-descendant) of B.

vs

> A shadow-including inclusive descendant is an object or one of its [shadow-including descendants](https://dom.spec.whatwg.org/#concept-shadow-including-descendant).
> An object A is a shadow-including descendant of an object B, if A is a [descendant](https://dom.spec.whatwg.org/#concept-tree-descendant) of B, or A’s [root](https://dom.spec.whatwg.org/#concept-tree-root) is a [shadow root](https://dom.spec.whatwg.org/#concept-shadow-root) and A’s [root](https://dom.spec.whatwg.org/#concept-tree-root)’s [host](https://dom.spec.whatwg.org/#concept-documentfragment-host) is a [shadow-including inclusive descendant](https://dom.spec.whatwg.org/#concept-shadow-including-inclusive-descendant) of B.

[spec source](https://dom.spec.whatwg.org/#concept-shadow-including-inclusive-ancestor)

My understanding of the spec is that since the above _Node remove_ steps are for "inclusive descendants", they should be scoped to be within the tree scope and not cross shadow trees. I don't think the steps need to mention shadow host specific behavior.

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