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

> the is attribute has been around for years now in V0. I have said it's an old demo but feel free to keep talking about it.

You brought it up.  Personally I just came across `is` now in V1 of the spec.  If neither Apple nor MS adopts it, then we all need Polyfills if we want to provide a good user experience and we will probably need that for custom elements for a long time even if they do, which is exactly why we don't need `is`.

Cheers

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