picture_in_picture library Null safety

Picture-in-Picture

https://w3c.github.io/picture-in-picture/

Classes

PictureInPictureEvent
The interface represents picture-in-picture-related events, including enterpictureinpicture, leavepictureinpicture and resize
PictureInPictureEventInit
PictureInPictureWindow
The PictureInPictureWindow interface represents an object able to programmatically obtain the width and height and resize event of the floating video window. [...]