Re: [w3c/webcomponents] Can't reuse custom element constructors? (#618)

In a parallel universe, where extending natives different from `HTMLElement` is already possible:
```js
class CustomQuoteElement extends HTMLQuoteElement {
  /* common implementation / overrides */
}
class CustomBlockquote extends CustomQuoteElement {}
class CustomQ extends CustomQuoteElement {}

customElements.define('custom-bq', CustomBlockquote);
customElements.define('custom-q', CustomQ);
```
If that was possible, let's say like it is already through `is="" mechanism`, I don't see any ambiguity or limitation.

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