https://wccftech.com/youtube-hdr-iphone-xs/

YouTube now supports HDR playback on the new iPhone XS and iPhone XS Max with the latest update.

It’s been a while since the new iPhones have been with us but it was only yesterday YouTube added support for HDR video on its official app for iOS. If you either have an iPhone XS and iPhone XS Max, then you can take full advantage of the HDR content available on YouTube. Previously, HDR support was only limited to iPhone 8, iPhone 8 Plus and iPhone X on the iOS side of the fence. But thankfully, owners of Apple’s new smartphones can now take full advantage of high dynamic range content.