Re: [w3ctag/design-reviews] Pre-CR review: DOM Review Draft — Published 21 June 2021 (#658)

Hi @siusin,

@plinss and looked at this today during our virtual f2f.

We had some questions:

- We see references to a new "precustomized" state for custom elements, but we did not find a definition of what this state means, and how do you get there. It seems to be completely undefined.
- There is an "is available to element internals" flag, but no definition of what it means
- If `shadowRoot` is available to internals, is there a difference between `this.shadowRoot` and `this.internals.shadowRoot` or do they point to the same thing?
- We see a new `delegatesFocus` property has been added on `ShadowRoot`, but there is no description of what it's supposed to do. By looking around we found [this](https://html.spec.whatwg.org/multipage/interaction.html#data-model), but it's still unclear what use cases it solves and what exactly it does.

The rest of the changes seem fine.

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