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

@richardkazuomiller You have MutationObservers at your disposal, so you can mimic everything `is` gives you in normal JavaScript unless you depend on synchronous callbacks. So you don't need to create a `<fancy-anchor>` element but rather can use a `data-fancy-anchor` attribute on a normal anchor, use mutation observers to know when the element is connected/disconnected and when attributes change.

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