RazorDocument - [0..20)::20 - [@tagHelperPrefix Foo]
    MarkupBlock - [0..20)::20
        MarkupTextLiteral - [0..0)::0 - [] - Gen<Markup> - SpanEditHandler;Accepts:Any
            Marker;[];
        CSharpCodeBlock - [0..20)::20
            RazorDirective - [0..20)::20
                CSharpTransition - [0..1)::1 - Gen<None> - SpanEditHandler;Accepts:None
                    Transition;[@];
                RazorDirectiveBody - [1..20)::19
                    RazorMetaCode - [1..16)::15 - Gen<None> - SpanEditHandler;Accepts:None
                        Identifier;[tagHelperPrefix];
                    CSharpCodeBlock - [16..20)::4
                        MarkupTextLiteral - [16..17)::1 - [ ] - Gen<None> - SpanEditHandler;Accepts:None
                            Whitespace;[ ];
                        CSharpStatementLiteral - [17..20)::3 - [Foo] - Gen<TagHelperPrefix:{Foo;Foo}> - SpanEditHandler;Accepts:AnyExceptNewline
                            Identifier;[Foo];
        MarkupTextLiteral - [20..20)::0 - [] - Gen<Markup> - SpanEditHandler;Accepts:Any
            Marker;[];
    EndOfFile;[];
