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

@oleersoy [this sort of comment](https://github.com/w3c/webcomponents/issues/509#issuecomment-449487091) does not meet the standards of professional behaviour expected here.

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Received on Friday, 21 December 2018 20:17:31 UTC