[Webkit-unassigned] [Bug 182671] Implementation (or not) of customized builtins (is="" attribute)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=182671

--- Comment #7 from Joe Pea <joe at trusktr.io> ---
I forgot to show in my previous comment that you need `observedAttributes` defined in order for `attributeChangedCallback` to work, just like with custom elements.

```
class AwesomeButton {
  // ... same as before, but you also need this:
  static observedAttributes = ['list', 'attributes', 'to', 'observe']
}
```

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