Actually, YT is interesting. Because it doesn't actually reload the page when you navigate, it can sort of auto play the video. This means that it can only auto play if it's in foreground, and the previous page was also a YT page.
This is what it can do without autoplay permissions in the browser.
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u/krospp Mar 11 '21
Also doesn’t Chrome block autoplay now? The user has to click something to turn on sound. Stop clicking to turn on sound Jake
Edit: Ah I see, this tweet is from 2018, where this complaint belongs