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

> You can see that element is both a button and with an attribute is="buton" so, at this point, I might just go ahead and create a polyfill for Safari/WebKit only until they realize it's better native than poly filled.

Except by not using `<button is="my-button" ...` in the HTML and using `extends: '...'` instead then it is not backwards compatible with browsers (such as elinks) that don't support javascript.  The point of this standard is for backwards compatibility in areas where it really matters.

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