How about `The tag to wrap the <paramref name="message"/> in the generated HTML.` instead?  Current description is a bit roundabout.  I'm fine to leave out "in the generated HTML" as well.

Should probably reference `<see cref="ViewContext.ValidationMessageElement` />` in the resource.  That is `... Default value is <see cref="ViewContext.ValidationMessageElement` />`.

I missed this in the legacy MVC review, sorry.