Picture in Picture, a self-explanatory feature which debuted on compatible iPads with last September's release of iOS 9, is coming to the desktop near you. That's right, now desktop users can watch video while they're multitasking on their Mac, thanks to Picture in Picture support on macOS Sierra.
With a click, you can float a clip from Safari or iTunes in a window over your desktop, and continue watching it as you're multitasking. The video can be resized, dragged and pinned to any corner of the screen and it even stays put when you switch Spaces.