title: What is a possible causes that Picture-in-Picture is not enabled inside my web document?
body: <p>I think that my question is pretty simple from a title, bellow are additional information.</p>
  
  <p>I have a little project in Laravel, and I want to implement Real-Time Video Calls using ApiRTC.
  When Local Stream is loaded (I can see myself in a  element), it should also have a PIP function.. But unfortunately, it is not the case. </p>
  
  <p>Error is "requestPictureInPicture is not a function", from that I concluded that PIP API is not enabled.. but I can't understand why?</p>
  
  <p>P.S. It is enabled in my browser, I checked that inside about:config.</p>