Markup block - Gen<None> - 24 - (0:0,0)
    Tag block - Gen<None> - 5 - (0:0,0)
        Markup span - Gen<Markup> - [<foo>] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:3
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.Text;[foo];
            SyntaxKind.CloseAngle;[>];
    HtmlComment block - Gen<None> - 13 - (5:0,5)
        Markup span - Gen<Markup> - [<!--] - SpanEditHandler;Accepts:None - (5:0,5) - Tokens:3
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.Bang;[!];
            SyntaxKind.DoubleHyphen;[--];
        Markup span - Gen<Markup> - [ ] - SpanEditHandler;Accepts:Whitespace - (9:0,9) - Tokens:1
            SyntaxKind.Whitespace;[ ];
        Expression block - Gen<Expr> - 4 - (10:0,10)
            Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (10:0,10) - Tokens:1
                SyntaxKind.Transition;[@];
            Code span - Gen<Expr> - [foo] - ImplicitExpressionEditHandler;Accepts:NonWhitespace;ImplicitExpression[RTD];K14 - (11:0,11) - Tokens:1
                SyntaxKind.Identifier;[foo];
        Markup span - Gen<Markup> - [ ] - SpanEditHandler;Accepts:Whitespace - (14:0,14) - Tokens:1
            SyntaxKind.Whitespace;[ ];
        Markup span - Gen<Markup> - [-->] - SpanEditHandler;Accepts:None - (15:0,15) - Tokens:2
            SyntaxKind.DoubleHyphen;[--];
            SyntaxKind.CloseAngle;[>];
    Tag block - Gen<None> - 6 - (18:0,18)
        Markup span - Gen<Markup> - [</foo>] - SpanEditHandler;Accepts:None - (18:0,18) - Tokens:4
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.ForwardSlash;[/];
            SyntaxKind.Text;[foo];
            SyntaxKind.CloseAngle;[>];
