Re: [w3c/webcomponents] Custom pseudo-classes for host elements via shadow roots (:state) (#738)

The expectation — but not requirement — would be that elements exposing pseudo-classes would often have a shadow root. I tried to keep the example as short as possible to focus on the aspects related to custom parts and pseudo-classes, and tried to reflect that with the comment in `DotElement`:

```js
// Not shown: Creation and population of shadow root...
```

The example is a simplification of our [Carousel](https://component.kitchen/elix/Carousel) component, whose dots indeed have a shadow root. (As you guess, it has a div that renders as a circle through border-radius.)

When I have a moment, I'll try to revise the gist to show the use of a shadow root.

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