Re: [WICG/webcomponents] [element-internals] How to get internals in base class and subclass, without leaking it to public (Issue #962)

> ```js
> customElements.define('my-el', class extends HTMLElement {
> static get disabledFeatures() { return ['internals']; }
> })
> document.createElement('my-el').attachInternals() // throws
> ```

That API seems backwards. Perhaps it should have been this:

```js
customElements.define('my-el', class extends HTMLElement {})
document.createElement('my-el').attachInternals() // throws
```

```js
customElements.define('my-el', class extends HTMLElement {
  static enabledFeatures = ['internals']
})
document.createElement('my-el').attachInternals() // does not throw
```

But that's tangential anyway. Once the feature is available, protecting it is difficult.

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