Re: [w3c/webcomponents] Why must the is="" attribute exist? (#509)

The problem here is that UA internally checks local name e.g. `element.localName == aTag` to do various things, and all of that code needs to be updated to account for the fact there could be an intense of `HTMLAnchorElement` whose local name is not `a`.

Now I'm going to re-iterate that Apple objects to extending subclasses of `HTMLElement` using `is=` as currently spec'ed for various reasons we've stated in the past so this feature won't be supported in WebKit anyway.

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