RazorDocument - [0..27)::27 - [{<span foo='abc @@ def' />}]
    MarkupBlock - [0..27)::27
        MarkupTextLiteral - [0..1)::1 - [{] - Gen<Markup> - SpanEditHandler;Accepts:Any
            Text;[{];
        MarkupTagBlock - [1..26)::25 - [<span foo='abc @@ def' />]
            MarkupTextLiteral - [1..6)::5 - [<span] - Gen<Markup> - SpanEditHandler;Accepts:Any
                OpenAngle;[<];
                Text;[span];
            MarkupAttributeBlock - [6..23)::17 - [ foo='abc @@ def']
                MarkupTextLiteral - [6..7)::1 - [ ] - Gen<Markup> - SpanEditHandler;Accepts:Any
                    Whitespace;[ ];
                MarkupTextLiteral - [7..10)::3 - [foo] - Gen<Markup> - SpanEditHandler;Accepts:Any
                    Text;[foo];
                Equals;[=];
                MarkupTextLiteral - [11..12)::1 - ['] - Gen<None> - SpanEditHandler;Accepts:Any
                    SingleQuote;['];
                GenericBlock - [12..22)::10
                    MarkupLiteralAttributeValue - [12..15)::3 - [abc]
                        MarkupTextLiteral - [12..15)::3 - [abc] - Gen<Markup> - SpanEditHandler;Accepts:Any
                            Text;[abc];
                    MarkupBlock - [15..18)::3
                        MarkupTextLiteral - [15..17)::2 - [ @] - Gen<LitAttr: @(15:0,15)> - SpanEditHandler;Accepts:None
                            Whitespace;[ ];
                            Transition;[@];
                        MarkupEphemeralTextLiteral - [17..18)::1 - [@] - Gen<None> - SpanEditHandler;Accepts:None
                            Transition;[@];
                    MarkupLiteralAttributeValue - [18..22)::4 - [ def]
                        MarkupTextLiteral - [18..19)::1 - [ ] - Gen<Markup> - SpanEditHandler;Accepts:Any
                            Whitespace;[ ];
                        MarkupTextLiteral - [19..22)::3 - [def] - Gen<Markup> - SpanEditHandler;Accepts:Any
                            Text;[def];
                MarkupTextLiteral - [22..23)::1 - ['] - Gen<None> - SpanEditHandler;Accepts:Any
                    SingleQuote;['];
            MarkupTextLiteral - [23..26)::3 - [ />] - Gen<Markup> - SpanEditHandler;Accepts:Any
                Whitespace;[ ];
                ForwardSlash;[/];
                CloseAngle;[>];
        MarkupTextLiteral - [26..27)::1 - [}] - Gen<Markup> - SpanEditHandler;Accepts:Any
            Text;[}];
