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

@oleersoy 
> But is that the only reason?

Progressive fallback.  `<my-decorated-button>` will not work when it is an old browser where <button is="my-decorated-button">` will, or any other element with functionality like input's, tables, etc... etc...

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