Re: [WICG/webcomponents] Non-class based example of customElement.define() (#587)

@sapphous Class syntax is itself part of the “prototype paradigm,” but as others have mentioned, you don’t actually have to use it:

```js
function NoClassSyntaxElement() {
  return Reflect.construct(HTMLElement, [], new.target);
  // or Reflect.construct(HTMLElement, [], NoClassSyntaxElement), I suppose, if you don’t care about subclassing
}

NoClassSyntaxElement.__proto__ = HTMLElement;
NoClassSyntaxElement.prototype.__proto__ = HTMLElement.prototype;

customElements.define('no-class-syntax', NoClassSyntaxElement);

console.log(new NoClassSyntaxElement().matches(':defined')); // true
```

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