Markup block - Gen<None> - 15 - (0:0,0)
    Markup span - Gen<Markup> - [] - SpanEditHandler;Accepts:Any - (0:0,0) - Tokens:1
        SyntaxKind.Unknown;[];
    Directive block - Gen<Directive:{TestDirective;SingleLine;Unrestricted}> - 15 - (0:0,0)
        Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:1
            SyntaxKind.Transition;[@];
        MetaCode span - Gen<None> - [TestDirective] - SpanEditHandler;Accepts:None - (1:0,1) - Tokens:1
            SyntaxKind.Identifier;[TestDirective];
        Code span - Gen<None> - [ ] - SpanEditHandler;Accepts:Whitespace - (14:0,14) - Tokens:1
            SyntaxKind.Whitespace;[ ];
        Code span - Gen<DirectiveToken {;Member;Opt:True}> - [] - DirectiveTokenEditHandler;Accepts:NonWhitespace - (15:0,15) - Tokens:1
            SyntaxKind.Unknown;[];
    Markup span - Gen<Markup> - [] - SpanEditHandler;Accepts:Any - (15:0,15) - Tokens:1
        SyntaxKind.Unknown;[];
