Markup block - Gen<None> - 28 - (0:0,0)
    Tag block - Gen<None> - 21 - (0:0,0)
        Markup span - Gen<Markup> - [<span] - SpanEditHandler;Accepts:Any - (0:0,0) - Tokens:2
            HtmlTokenType.OpenAngle;[<];
            HtmlTokenType.Text;[span];
        Markup block - Gen<None> - 14 - (5:0,5)
            Markup span - Gen<Markup> - [ data-foo=] - SpanEditHandler;Accepts:Any - (5:0,5) - Tokens:3
                HtmlTokenType.WhiteSpace;[ ];
                HtmlTokenType.Text;[data-foo];
                HtmlTokenType.Equals;[=];
            Expression block - Gen<Expr> - 4 - (15:0,15)
                Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (15:0,15) - Tokens:1
                    CSharpTokenType.Transition;[@];
                Code span - Gen<Expr> - [foo] - ImplicitExpressionEditHandler;Accepts:NonWhiteSpace;ImplicitExpression[RTD];K14 - (16:0,16) - Tokens:1
                    CSharpTokenType.Identifier;[foo];
        Markup span - Gen<Markup> - [ >] - SpanEditHandler;Accepts:Any - (19:0,19) - Tokens:2
            HtmlTokenType.WhiteSpace;[ ];
            HtmlTokenType.CloseAngle;[>];
    Tag block - Gen<None> - 7 - (21:0,21)
        Markup span - Gen<Markup> - [</span>] - SpanEditHandler;Accepts:Any - (21:0,21) - Tokens:4
            HtmlTokenType.OpenAngle;[<];
            HtmlTokenType.ForwardSlash;[/];
            HtmlTokenType.Text;[span];
            HtmlTokenType.CloseAngle;[>];
