iOS 14, iPadOS 14, tvOS 14 and macOS Big Sur will let you play YouTube videos in 4K resolution and HDR color on your iPhone, iPad, iPod touch, Apple TV and Mac. While this feature has been present in earlier betas of iOS, iPadOS and tvOS 14, yesterday's release of Big Sur beta 4 has brought the ability to play 4K HDR YouTube videos to Safari on Mac.
macOS Big Sur beta 4 enables support for 4K HDR playback of YouTube videos in Safari
