Re: [w3c/webcomponents] fullscreenchange should be dispatched on each ancestor shadow root (#614)

I had the same reaction originally, as @annevk.
Okay, so assuming we have a YouTube search app that shows 100 thumbnails, and each can go fullscreen. Each component wants to listen to `fullscreenchange` event, but currently if one goes fullscreen, all 100 components are notified, which is quite wasteful.

I think option 1 works, but also would like to hear from @foolip the original design decision why we get an event on document.


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