HtmlString doesn't work in Blazor applications, and documentation is not clear about this

[joperezr]

When trying to render raw html into a razor page, most people just use HtmlString type to convert a string into full html. When I wanted to do this in my Blazor app, I was able to reference HtmlString but it wasn't working as expected at runtime. After pinging some devs in the ASP.NET team, I was told that this is by design as Blazor requires MarkupString to be used instead. We should either:

• Add more documentation onto HtmlString to indicate that it shouldn't be used in Blazor
• Add a code analyzer which detects uses of HtmlString inside a Blazor app and emit a warning and suggestion to use MarkupString instead