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

Sorry, one more thing: For people who like fallbacks, in

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

, `<some-element>` can behave the same as a `<video>` element when there is not a definition for `some-element`.

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