The ability to move video into a picture-in-picture overlay with macOS Sierra is a great new feature. However, it doesn't appear to work with YouTube videos. You can get YouTube videos to do this, however, if you know how.
Related Subjects: Video (63 videos), Web (77 videos), YouTube (7 videos)
After activating Picture-In-Picture for Youtube you can also move the video around "anywhere" on the screen when holding down the Command/Cntl key.
Fascinating. Thanks. I don't know how you find out all this stuff!
Wow! thanks once again Gary