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

@oleersoy @WebReflection The email reply system is broken but essentially this was my comment.  Y**ou can only subclass HTMLElement right now.**  Furthermore, the reason one needs to identify which element you intend to extend is because elements can share script interfaces: 

**In general, the name of the element being extended cannot be determined simply by looking at what element interface it extends, as many elements share the same interface (such as q and blockquote both sharing HTMLQuoteElement).**

So I guess the JavaScript engine has to know which element to create (?) in the DOM given it has multiple potential elements to pick from.  Given all that I grant you it is something for programmers to learn/understand.

Apologies all of the formatting is lost when you reply by email - won't do that again :-)

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