Re: [webcomponents] [Shadow]: Update constraints around stopping events (bugzilla: 20247) (#61)

So I think in part a problem I need to solve is that DOM needs to define event path calculation better. Apart from the node tree Indexed DB also needs a hook for this. I opened https://github.com/w3c/IndexedDB/issues/66 to discuss their requirements.

It would be useful to know how you think event path calculation works at a low-level.

My intuition was that dispatch asks event target for an event path and that event target has an algorithm that returns the event target itself (the default event path for most objects), but can be overwritten by special event targets, such as nodes and certain Indexed DB objects to return a list of event targets.

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