Re: [w3c/webcomponents] The is="" attribute is confusing? Maybe we should encourage only ES6 class-based extension. (#509)

@csuwildcat I like your refinement, I just think maybe `extensions` should be kept singular for consistency with the rest of the language (CSS has no plural forms, only eventually third parts)

```css
form *:extension(button-like) {}
extension(button-like) and extension(select-like) {}
```

This would play nice with the semantic used in
```js
customElements.defineExtension(
  'button-like',
  {
    implements: [
      HTMLImageBehavior,
      HTMLButtonBehavior,
      HTMLButtonAppearance
    ]
  }
);
```

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