Markup block - Gen<None> - 12 - (0:0,0)
    Tag block - Gen<None> - 12 - (0:0,0)
        Markup span - Gen<Markup> - [<foo ] - SpanEditHandler;Accepts:Any - (0:0,0) - Tokens:3
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.Text;[foo];
            SyntaxKind.Whitespace;[ ];
        Expression block - Gen<Expr> - 4 - (5:0,5)
            Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (5:0,5) - Tokens:1
                SyntaxKind.Transition;[@];
            Code span - Gen<Expr> - [bar] - ImplicitExpressionEditHandler;Accepts:NonWhitespace;ImplicitExpression[RTD];K14 - (6:0,6) - Tokens:1
                SyntaxKind.Identifier;[bar];
        Markup span - Gen<Markup> - [ />] - SpanEditHandler;Accepts:None - (9:0,9) - Tokens:3
            SyntaxKind.Whitespace;[ ];
            SyntaxKind.ForwardSlash;[/];
            SyntaxKind.CloseAngle;[>];
