Re: [whatwg/dom] Allow for customisation of the "get the parent" algorithm (PR #1230)

@annevk commented on this pull request.



> @@ -908,9 +908,14 @@ for historical reasons.
 <h3 id=interface-eventtarget>Interface {{EventTarget}}</h3>
 
 <pre class=idl>
+[Exposed=*]
+interface EventTargetInternals {
+  attribute EventTarget parent;
+};
+

Yeah, I suppose we could also do what `new Promise()` does, but it doesn't seem as extensible:
```js
new EventTarget(setParent => {
  setParent(someParent);
}
```
I think as long as the capability is only granted to whoever constructed the `EventTarget` object I'm okay, so alternative proposals welcome.

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