Re: [w3c/webcomponents] Why must the is="" attribute exist? (#509)

@domenic 

We should make the result of `instanceof` be obvious. I think this could be better in v1 (without `is=""` and without `options.extends`):

```html
<my-el></my-el>
```
```js
class MyEl extends HTMLDivElement { /*... */ }
customElements.define('my-el', MyEl)

// ...

document.querySelector('my-el') instanceof MyEl // true!
```

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