Picture-in-picture allows users to continue watching a video outside of the app, making it possible to watch a clip while working on a document, browsing the web, or editing a photo. Picture-in-picture support at the OS level first launched on iPad with iOS 9, before making the leap to iPhone...
https://www.techspot.com/news/90123-youtube-brings-picture-picture-iphones-ipads.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/90123-youtube-brings-picture-picture-iphones-ipads.html?utm_source=dlvr.it&utm_medium=blogger