pictureInPictureOrNull

Picture in picture for the canvas this player draws on, or null when it was started without one or this browser has neither feature KitePlayerPictureInPicture uses. The canvas belongs to the worker, and both features still carry its frames: the document window takes the page's canvas element, and the video element's window plays a live capture of it. Its play and pause buttons play and pause this player. Call start from the viewer's click, as there.