Windows 11 build 21319

Windows 10 build 21319 is an unleaked build of Cobalt. A screenshot of Windows Terminal running in this build was posted to GitHub by a Microsoft employee on 25 February 2021. Its buildtag was later mentioned by the same employee in a GitHub issue on 2 March 2021. It was also mentioned in several screenshots of this build's Windows Terminal, as well as in a screenshot of Command Prompt running in Windows Preinstallation Environment of this build shown in a blog article "Windows Recovery Environment explained" posted to Microsoft Tech Community by a Microsoft employee on 14 April 2021.