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

@trusktr

Well, that *could* work, but that would probably be a lot harder to parse — and browser vendors have already shown their disinterest in changing the parser —, it wouldn’t be as convenient, it would be harder (even if slightly) to understand, it wouldn’t be immediately clear by the looking at the tag name that `<my-foo extends="table">` would act as a table, and your fallback would not work for old user agents that don’t support custom elements.

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