Markup block - Gen<None> - 6 - (0:0,0)
    Tag block - Gen<None> - 2 - (0:0,0)
        Markup span - Gen<Markup> - [<>] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:2
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.CloseAngle;[>];
    Tag block - Gen<None> - 3 - (2:0,2)
        Markup span - Gen<Markup> - [</>] - SpanEditHandler;Accepts:None - (2:0,2) - Tokens:3
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.ForwardSlash;[/];
            SyntaxKind.CloseAngle;[>];
    Markup span - Gen<Markup> - [ ] - SpanEditHandler;Accepts:None - (5:0,5) - Tokens:1
        SyntaxKind.Whitespace;[ ];
