Markup block - Gen<None> - 32 - (0:0,0)
    Markup span - Gen<Markup> - [] - SpanEditHandler;Accepts:Any - (0:0,0) - Tokens:1
        SyntaxKind.Unknown;[];
    Directive block - Gen<None> - 32 - (0:0,0)
        Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:1
            SyntaxKind.Transition;[@];
        MetaCode span - Gen<None> - [addTagHelper] - SpanEditHandler;Accepts:None - (1:0,1) - Tokens:1
            SyntaxKind.Identifier;[addTagHelper];
        Markup span - Gen<None> - [     ] - SpanEditHandler;Accepts:None - (13:0,13) - Tokens:1
            SyntaxKind.Whitespace;[     ];
        Code span - Gen<AddTagHelper:{Foo,   Bar;Foo,   Bar;Foo;Bar}> - [Foo,   Bar    ] - SpanEditHandler;Accepts:AnyExceptNewline - (18:0,18) - Tokens:5
            SyntaxKind.Identifier;[Foo];
            SyntaxKind.Comma;[,];
            SyntaxKind.Whitespace;[   ];
            SyntaxKind.Identifier;[Bar];
            SyntaxKind.Whitespace;[    ];
    Markup span - Gen<Markup> - [] - SpanEditHandler;Accepts:Any - (32:0,32) - Tokens:1
        SyntaxKind.Unknown;[];
