Re: [w3c/webcomponents] Repurposing the is="" attribute to allow multiple behaviors to be attached to a given element (#662)

If this is intended for mixins consider adding a new, non-conflicting attribute as `<any has="this, that, more, extensions"></any>` and `<any has="stuff"></any>` to associate something with any existing element. And this simply extends the existing classes, hooking into the existing lifecycle of the element.

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