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

@wanttofly88 AFAIK Chrome shipped builtins extends already and Firefox shipped those too.

```js
class MyButton extends HTMLButtonElement {}
customElements.define('my-button', MyButton, {extends: 'button'});
document.body.appendChild(
  new MyButton
).textContent = 'click me';
```

You can see that element is both a button and with an attribute `is="buton"` so, at this point, I might just go ahead and create a polyfill for Safari/WebKit only until they realize it's better native than poly filled.


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