Picture-in-picture (PiP) mode is a popular feature for watching videos in a separate window, usually on top of other windows, while doing other tasks. The feature was introduced to all YouTube users on Android 8.0 in June, and now it's also being pushed to Google Chrome for Linux, macOS, and Windows.
Chrome evangelist François Beaufort announced the feature's release via his Google+ account, saying PiP is now enabled by default in Chrome for all those platforms. The feature is also expected to arrive on Chrome OS and Android devices in the near future. Watch the video below to see how PiP works:
In the meantime, if you wish to give it a try on Chrome OS, you can enable the experimental chrome://flags/#enable-surfaces-for-videos flag in the platform. To get started with PiP, simply right-click within a video frame and choose picture-in-picture from the options. Keep in mind, though, that this method applies only to YouTube. For other players, you may need to click twice to pull up the Chrome menu.
The PiP mode was also announced for Android Oreo in August last year to allow users to better multitask. Today's announcement marks the feature's expansion to the desktop.