MarkupBlock - [0..12)::12 - [<foo @bar />]
    MarkupTagBlock - [0..12)::12 - [<foo @bar />]
        MarkupTextLiteral - [0..5)::5 - [<foo ] - Gen<Markup> - SpanEditHandler;Accepts:Any
            OpenAngle;[<];
            Text;[foo];
            Whitespace;[ ];
        CSharpCodeBlock - [5..9)::4
            CSharpImplicitExpression - [5..9)::4
                CSharpTransition - [5..6)::1 - Gen<None> - SpanEditHandler;Accepts:None
                    Transition;[@];
                CSharpImplicitExpressionBody - [6..9)::3
                    CSharpCodeBlock - [6..9)::3
                        CSharpExpressionLiteral - [6..9)::3 - [bar] - Gen<Expr> - ImplicitExpressionEditHandler;Accepts:NonWhitespace;ImplicitExpression[RTD];K14
                            Identifier;[bar];
        MarkupTextLiteral - [9..12)::3 - [ />] - Gen<Markup> - SpanEditHandler;Accepts:None
            Whitespace;[ ];
            ForwardSlash;[/];
            CloseAngle;[>];
