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

@rniwa I second @Zambonifofex, would love to know the rational behind this. In the case of needing features exclusive to native elements, how would someone use these features on a custom element without extending it?

An example my company is dealing with is replicating the sizing of a native `img` element, so far we haven't found _any_ cross browser way to replicate the way it sizes, therefore having an element extension, so right now using `is`, is the only way to achieve this.

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