[w3c/selection-api] `anchorNode` & `focusNode` can never be in shadow tree? (Issue #361)

yezhizhen created an issue (w3c/selection-api#361)

> [anchor](https://w3c.github.io/selection-api/#dfn-anchor) and [focus](https://w3c.github.io/selection-api/#dfn-focus) of [selection](https://w3c.github.io/selection-api/#dfn-selection) need not to be in the [document tree](https://dom.spec.whatwg.org/#concept-document-tree). It could be in a [shadow tree](https://dom.spec.whatwg.org/#concept-shadow-tree) of the same [document](https://dom.spec.whatwg.org/#document).

However, it also says:
[anchorNode](https://w3c.github.io/selection-api/#dom-selection-anchornode)
    The attribute must return the [anchor](https://w3c.github.io/selection-api/#dfn-anchor) [node](https://dom.spec.whatwg.org/#boundary-point-node) of [this](https://webidl.spec.whatwg.org/#this), or null if the [anchor](https://w3c.github.io/selection-api/#dfn-anchor) is null or [anchor](https://w3c.github.io/selection-api/#dfn-anchor) is not in the [document tree](https://dom.spec.whatwg.org/#concept-document-tree).

So `anchorNode` can never be in shadow tree. This is also contradictory to tests:
https://github.com/servo/servo/blob/e83f3117045171e59f230c3b36ebd721826d3754/tests/wpt/tests/selection/shadow-dom/tentative/Selection-isCollapsed.html#L48

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