Markup block - Gen<None> - 19 - (0:0,0)
    Tag block - Gen<None> - 5 - (0:0,0)
        Markup span - Gen<Markup> - [<foo>] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:3
            HtmlTokenType.OpenAngle;[<];
            HtmlTokenType.Text;[foo];
            HtmlTokenType.CloseAngle;[>];
    Markup span - Gen<None> - [@] - SpanEditHandler;Accepts:Any - (5:0,5) - Tokens:1
        HtmlTokenType.Transition;[@];
    Markup span - Gen<Markup> - [@] - SpanEditHandler;Accepts:Any - (6:0,6) - Tokens:1
        HtmlTokenType.Transition;[@];
    Markup span - Gen<None> - [@] - SpanEditHandler;Accepts:Any - (7:0,7) - Tokens:1
        HtmlTokenType.Transition;[@];
    Markup span - Gen<Markup> - [@] - SpanEditHandler;Accepts:Any - (8:0,8) - Tokens:1
        HtmlTokenType.Transition;[@];
    Expression block - Gen<Expr> - 4 - (9:0,9)
        Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (9:0,9) - Tokens:1
            CSharpTokenType.Transition;[@];
        Code span - Gen<Expr> - [bar] - ImplicitExpressionEditHandler;Accepts:NonWhiteSpace;ImplicitExpression[RTD];K14 - (10:0,10) - Tokens:1
            CSharpTokenType.Identifier;[bar];
    Tag block - Gen<None> - 6 - (13:0,13)
        Markup span - Gen<Markup> - [</foo>] - SpanEditHandler;Accepts:None - (13:0,13) - Tokens:4
            HtmlTokenType.OpenAngle;[<];
            HtmlTokenType.ForwardSlash;[/];
            HtmlTokenType.Text;[foo];
            HtmlTokenType.CloseAngle;[>];
