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

@richardkazuomiller  Thanks that seems reasonable.  What if the `<app-drawer>` uses the shadow-dom - will it continue to render and work as expected, given that we override the css used to display the element initially?  @rniwa IIUC seems to be saying that any custom element that uses the shadow dom will terminate the progressive enhancement capability afforded to us by `is`?

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