you should checkout AvalonuiaUI[0] or unoPlatform[1] if wanting to target web/mobile/window/linux/macOS

if building for the web online, asp.net core runs on Linux servers as well as windows

and there's MAUI [2] ( not a fan of this), you are better-off with with the others.

in summary c# and .NET is cross-platform, third party developers build better frameworks and tools for other platform while Microsoft prefers to develop for Microsoft ecosystem, if you get

[0] https://avaloniaui.net/ [1] https://platform.uno/ [2] https://learn.microsoft.com/en-us/dotnet/maui/what-is-maui?v...