MVC & Razor Pages support creating server rendered forms with client validation where the client validation is based on data annotations and then implemented with framework provided client-side JavaScript using unobtrusive validation.

With Blazor in .NET 8 we can now create server rendered forms that are rendered statically and support server validation based on data annotations. But if you want client validation then you need to enable server interactivity, which means creating a circuit and handling the additional server load.

This issue tracks discussing if we need a way to do client validation in Blazor without using Blazor Server or Blazor WebAssembly.