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

> > Honestly, I’m starting to agree with @rniwa and Apple more and more that it might be better to simply not allow extending built‐in elements; at least not in the same way we extend custom elements.
>
> It might be a genius point for now. Instead of extending built ins, replicate the features of the built ins in external classes, extend those classes to get the features needed, and then consolidate that with Web IDL, and finally we will have a clean fit.

*ahem* #567 *ahem*

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