https://wccftech.com/youtube-website-supports-picture-in-picture-mode-on-iphone-again-in-ios-14-5-beta/

iOS 14 brought a lot to the table for users when it launched back in September of last year. One of the nifty little features added to the iPhone with iOS 14 was Picture-in-Picture. One of the most widely used apps around the globe, YouTube quickly added support for the feature. It allowed users to watch miniaturized videos on iPhone and also housed the ability to resize the window. However, it was short-lived as Google decided to remove Picture-in-Picture from YouTube's website. Now, iOS 14.5 beta brings back the Picture-in-Picture on iPhone.

As of now, we're not sure if Google will remove support for the feature again. It has happened before and it wouldn't be wrong to expect if Picture-in-Picture is here to stay with iOS 14.5 on the iPhone. Tests have revealed that Picture-in-Picture for YouTube on iPhone works on several third-party browser apps (via MacRumors). This includes Safari, Google Chrome, Firefox, and more. In addition to this, there's not much that you have to do in order to enable it.