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

@rniwa Very glad to hear that you also think extending native builtins is useful.  I hope you are able to come to some agreement with your peers over this.  FWIW, I think `is` works quite well for the [map element ](http://maps4html.github.io/Web-Map-Custom-Element/)and I would be very interested to hear your thoughts on improving on `is` for PE-focused HTML authors, for whom `is` will make custom elements useful.

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