Re: [webcomponents] [Custom]: inflexible extends as fixed element type (bugzilla: 28158) (#143)

I think this is solved by using a factory that returns custom element classes/registering them. You could easily write the function

```js
function makeSuperElement(BaseClass, baseTagName) {
  class SuperElement extends BaseClass { ... };
  document.registerElement(SuperElement, { extends: baseTagName });
  return SuperElement;
});
```

and then call it many times.

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