YouTube quietly announced the feature on its new experiments page, where it revealed the testing period for picture-in-picture lasts until October 31, but only YouTube Premium members on iOS can try it. According to tech news site TechCrunch, YouTube has been sending invitations to join the test to some of those Premium subscribers.
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Picture-in-picture allows users to watch videos in a mini player while browsing other apps at the same time. Premium members can adjust where the video appears on a device and change its size by pinching to enlarge or minimize. The smaller video also comes with the standard play/pause buttons and rewind/forward controls.