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

> instead of being stuck with single inheritance model it'd be so fun creating components and apps.

The above custom-attributes and element-behaviors are sorts of "mixin"-like ideas, whereby we can mix and match multiple functionalities into one element.

@WebReflection By the way, you can have multiple inheritance with class-factory mixins. Check out my [`Mixin`](https://github.com/trusktr/lowclass/blob/master/src/Mixin.js) tool. Here's the [tests](https://github.com/trusktr/lowclass/blob/master/src/Mixin.js), and here's [an example](https://github.com/trusktr/infamous/blob/master/src/core/Sizeable.js#L17-L24) where my `Sizeable` class extends from both `Observable` and `TreeNode` classes.

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