Re: [whatwg/dom] Should Live Range expose endpoints inside a shadow tree? (Issue #1362)

dizhang168 left a comment (whatwg/dom#1362)

In the Selection API spec, the definitions for anchor/focus says:
> Each [selection](https://w3c.github.io/selection-api/#dfn-selection)s also have an anchor and a focus. If the [selection](https://w3c.github.io/selection-api/#dfn-selection)'s [range](https://dom.spec.whatwg.org/#concept-range) is null, its [anchor](https://w3c.github.io/selection-api/#dfn-anchor) and [focus](https://w3c.github.io/selection-api/#dfn-focus) are both null. If the [selection](https://w3c.github.io/selection-api/#dfn-selection)'s [range](https://dom.spec.whatwg.org/#concept-range) is not null and its [direction](https://w3c.github.io/selection-api/#dfn-direction) is [forwards](https://w3c.github.io/selection-api/#dfn-forwards), its [anchor](https://w3c.github.io/selection-api/#dfn-anchor) is the [range](https://dom.spec.whatwg.org/#concept-range)'s [start](https://dom.spec.whatwg.org/#concept-range-start), and its [focus](https://w3c.github.io/selection-api/#dfn-focus) is the [end](https://dom.spec.whatwg.org/#concept-range-end). Otherwise, its [focus](https://w3c.github.io/selection-api/#dfn-focus) is the [start](https://dom.spec.whatwg.org/#concept-range-start) and its [anchor](https://w3c.github.io/selection-api/#dfn-anchor) is the [end](https://dom.spec.whatwg.org/#concept-range-end).

> Note [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).

Given this, the Selection API does expect the Range API to return endpoints that are within shadow trees.

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