Re: [whatwg/dom] Owned weak event listener to prevent memory leak (using EventListenerOptions) (#243)

@annevk 
I am not aware of such frameworks or sites. This feature is probably not polyfillable until ES weak referecne is avaible.

One of the evidence outside web platform is weak event in .net:
https://docs.microsoft.com/en-us/dotnet/framework/wpf/advanced/weak-event-patterns
https://www.codeproject.com/Articles/738109/The-NET-weak-event-pattern-in-Csharp
https://stackoverflow.com/questions/13788787/when-to-use-weak-events


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