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

The `is=""` API can be confusing. For example:

```html
<my-el></my-el>
```
```js
class MyEl extends HTMLElement { /*... */ }
MyEl.extends = 'div'
document.registerElement('my-el', MyEl)

// ...

document.querySelector('my-el') instanceof MyEl // true or false?
```

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