Re: [webcomponents] [Custom Elements] Import module (#329)

I think more natural way of doing that will be something like:
```html
<script type="module" src="my-component.js" import="my-button as custom-button">
...
<custom-button>...</custom-button>
<custom-button>...</custom-button>
...
```

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https://github.com/w3c/webcomponents/issues/329#issuecomment-143405818