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

@treshugart 

> I never mentioned your polyfill. Specifically, it was mostly the shadow DOM polyfill

like I've said in my talk, Shadow DOM is one of that things that cannot be polyfilled, like WeakMaps or Proxy. It was their fault not to warn about inevitable issues a polyfill would've caused, and your responsibility to not use it, since not essential for Custom Elements (indeed it's a different specification)

> I think it's best if we try and get this discussion back on track.

Agreed. However, we already wrote ideas but @rniwa says he needs more use cases or libraries implementing something impossible to implement without `is=""` so we're fully stuck in a circle here.

I've no idea how to move forward.

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