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

BTW, with `is` you can use your custom element inside `table, tr, tbody, select,....`, like
```html
<table>
    <template is"my-template">
```
, but for sure you cannot use  `<my-element>`
```html
<table>
    <my-template>
        <template>
```

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