Lately I've noticed that sometimes when watching a video I can have it play in a small pop out window on my screen while multitasking. However, it is not the usual pop up view window which takes up more space and isn't able to be made quite as small a window as this can. This has happened a few times now when I've been watching videos on YouTube and on chrome in full screen mode.
The above is an example of how the video plays and how the window seems different to that of the ordinary pop up window. Just trying to figure out how to actually do this as when it happens I struggle to get it to do it again.