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

@trusktr

What about being able to define both global attributes and attributes on specific elements?

```Javascript
customAttributes.define("foo-bar", HTMLElement, FooBarAttr); // Global attribute
customAttributes.define("foo-baz", MyElement, FooBazAttr); // Element‐specific attribute
```

Still, I like to encourage the practice of pseudo‐namespaces. That is, when writing a library, named, say, “my library”, instead of having a `fancy-button` element, have a `my_library-fancy_button` element. Similar thing with attributes.

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