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

FWIW, since "_[yurak is working on this](https://bugs.chromium.org/p/chromium/issues/detail?id=652579#c2)_", I guess all we have to do is wait that Firefox and Edge would follow and keep polyfilling WebKit (hopefully not forever).

This is a [page to check builtin extend status](http://webreflection.github.io/document-register-element/test/check.html?nope).

<sub>This is the [same page using my polyfill](http://webreflection.github.io/document-register-element/test/check.html?poly).</sub>

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