Re: [w3c/webcomponents] accessibility considerations: states and behaviors (#567)

that's not quite the way it works when you extends and it will fail in those browsers that allow creating `HTMLElement` extends only.

In any case, every modern, old, and nightly browser (beside FF nightly which is definitively not ready for CE v1) works already as it should thanks to this polyfill:
https://github.com/WebReflection/document-register-element#document-register-element-

Native extends have been used in production for years now via v0.
Dropping them, beside agreeing or not how simple or quirky these are, will likely break the web.

If vendors (just one for what I know) will keep ignoring current V1 specs, such vendor will be polyfilled so I don't see the problem.

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