Open a youtube video, detach the video, change to another tab. Wait a few seconds and the video will stop playing but the audio continues. Change back to the source tab and the video starts playing again.
Pretty much defeats the purpose of detaching the video if it won't continue playing without the source tab in focus.
On the plus side, it seems now videos are disabled from playing by default. Nice feature finally introduced.
I confirm positive: https://www.youtube.com https://ddn.disney.com https://www.dailymotion.com http://www.metacafe.com
Negative: https://www.veoh.com http://www.viddler.com
Surely some more
I do not work with blink engine at https://vimeo.com
(On the previous stable version, with the same configuration, vimeo yes works