chromePictureInPicture.js

// short way.
document.querySelectorAll('video')[0].disablePictureInPicture=false;document.querySelectorAll('video')[0].requestPictureInPicture();

// long way.
const pInP = async el => {
  el.disablePictureInPicture = false;
  await el.requestPictureInPicture();
}
const videos = document.querySelectorAll('video');
pInP(videos[0]);

// close via code:
document.exitPictureInPicture();