Picture in picture Web API with Javascript

When you watch Youtube, there is a mini-player in the right corner which is the same as the picture in the picture function. I think this is very useful for modern people’s life, who can do multiple things at the same time, such as browsing websites while watching some videos or doing notes when having class on one screen.
The video screen can be dragged anywhere you want and resized to any size you want. Efficient…