Re: [whatwg/dom] Capturing event listeners are called during bubbling phase for shadow hosts (#685)

Okay now that I understand what @annevk and @smaug---- are talking about. Yes, the order of invocations of event listeners on a given element would change from the registration order to capturing event listeners then bubbling event listeners.

But I'm a lot less concerned about that (especially now that you state Gecko has been doing this for years, and scripts don't typically register both capturing & bubbling event listeners on a single element) than the fact order of event dispatching on different elements would change. It's a lot more likely that some event listeners on different elements are relying on event listeners on another element getting events before/after them by stopping propagation, etc...

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