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

@OvermindDL1 I don't know where you come from, but let me assure you document-register-element polyfill, used by AMP project too, brought V0 to all meaningful implementations already, including AFrame, so we're all good to go, the V0 API is the only one battle tested in the real world.

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