Re: [whatwg/dom] [Proposal] Add EventTarget.getEventListeners() (#412)

>From a purely implementation point of view I don't think this would be a terrible hassle to implement. Blink internally uses the same EventListener machinery for some internal use cases, like IndexedDB index population and media controls and things. We'd just need some level of filtering or segregating for them.

I'm not sure about window. Are there any times you have cross origin iframes and different domains get to stick event listeners on the same window through the window proxy or anything like that?

As a recovering? wannabe? web developer I'm mildly anxious about the code that's out there assuming their event listeners, once registered, won't be messed with. On the other hand if you can get a reference to the EventTarget anyway you probably can already cause interesting headaches.

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