Re: [whatwg/dom] Allow custom "get the parent" algorithms for EventTargets (#583)

> My concerns with a getter/setter is a hard reference could leave an object in memory, prohibiting it from being garbage collection. With DOM nodes, once a child is detached from its parent, `.parentNode` becomes `null` (or `undefined`, not sure). The parent can then be garbage collected if it's no longer referenced. That's one of the reasons why I leaned to a function.

I'm not sure how that is consistent with the idea that EventTarget can have a parent. Is the idea that the event will propagate to the parent object only if that's still alive?? Literally nothing in the web platform works like that. I'm not certain we want to add API like this given its behavior will be highly dependent on a particular implementation of GC.


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