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

@oleersoy

This doesn’t work (`my-foo` goes before the table in the DOM):

```HTML
<table>
    <my-element>
```

This does:

```HTML
<table>
    <template is="my-element">
```

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