Directive block - Gen<None> - 17 - (0:0,0)
    Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:1
        CSharpTokenType.Transition;[@];
    MetaCode span - Gen<None> - [tagHelperPrefix] - SpanEditHandler;Accepts:None - (1:0,1) - Tokens:1
        CSharpTokenType.Identifier;[tagHelperPrefix];
    Markup span - Gen<None> - [ ] - SpanEditHandler;Accepts:None - (16:0,16) - Tokens:1
        CSharpTokenType.WhiteSpace;[ ];
    Code span - Gen<TagHelperPrefix:{;} [RZ1018(1:0,1 [15] )]> - [] - SpanEditHandler;Accepts:AnyExceptNewline - (17:0,17) - Tokens:1
        CSharpTokenType.Unknown;[];
