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

@csuwildcat I honestly think it might be a good idea to call these things "Element Interfaces".

As for css you hit the nail on the head for what I was trying to get at but maybe here is where the `is` word would be nice:
```css
form *:is(button-like) {

}
```

Which leads to the next piece: Declaratively adding interfaces to elements
```html
<input is="button-like" />
```

Thoughts?

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