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

I forgot to mention that the following should be possible too:

```html
<some-element extends="video" ...>
  ...
<some-element>
```

with emphasis on the fact that the _built-in_ element goes inside the `extends` property.

I argue the same if we keep `is=""`:

```html
<new-element extends="foo-element" ...>
  ...
</new-element>
<some-element extends="video" ...>
  ...
<some-element>
```

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