Base information of Blazor
Blazor is a single-page app framework for building interactive client-side Web apps with .NET. Blazor uses open web standards without plugins or code transpilation. Blazor works in all modern web browsers, including mobile browsers. (from Microsoft ASP.NET Website)
The famous Blazor demo application provides the case of clicking a button to increment a counter.
Microsoft Blazor is in Preview status but no longer Experiment
2019 April 18, Microsoft Blazor Project leader Daniel Roth announces that Blazor is in official Preview status, it is no longer experiment.