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Maybe it will be possible to whitelist certain sites like Youtube, that would be useful. Even more useful if it did figure out that by itself.

Yes it is exactly that, and says so on the macOS High Sierra page. :)

On youtube.com sure. But most people's issue is with auto-playing embedded videos.

If the page is in focus yes. If I open 5 videos in new tabs no.

I never want this. I always want click-to-play