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

> How about we fix that then? It's a spec and we are in new territory either way. It's like putting an addition on the house. We can change the spec. Maybe tear out the kitchen. Etc.

As long as it is backwards compatible enough to allow progressive enhancement enough that old non-js browsers can still be supported without needing to write duplicate custom sites for them.  I.E., a <button>, no matter how it is subclassed, **must** be a <button> in the html, regardless of whatever other attributes it may have.

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