Windows 11 build 21319

Windows 10 build 21319 is a build of Cobalt, the 21H2 development semester of Windows as a service. The full build tag was mentioned by a 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.