RazorDocument - [0..22)::22 - [{<span foo='@@def' />}]
    MarkupBlock - [0..22)::22
        MarkupTextLiteral - [0..1)::1 - [{] - Gen<Markup> - SpanEditHandler;Accepts:Any
            Text;[{];
        MarkupTagBlock - [1..21)::20 - [<span foo='@@def' />]
            MarkupTextLiteral - [1..6)::5 - [<span] - Gen<Markup> - SpanEditHandler;Accepts:Any
                OpenAngle;[<];
                Text;[span];
            MarkupAttributeBlock - [6..18)::12 - [ foo='@@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..17)::5
                    MarkupBlock - [12..14)::2
                        MarkupTextLiteral - [12..13)::1 - [@] - Gen<LitAttr:@(12:0,12)> - SpanEditHandler;Accepts:None
                            Transition;[@];
                        MarkupEphemeralTextLiteral - [13..14)::1 - [@] - Gen<None> - SpanEditHandler;Accepts:None
                            Transition;[@];
                    MarkupLiteralAttributeValue - [14..17)::3 - [def]
                        MarkupTextLiteral - [14..17)::3 - [def] - Gen<Markup> - SpanEditHandler;Accepts:Any
                            Text;[def];
                MarkupTextLiteral - [17..18)::1 - ['] - Gen<None> - SpanEditHandler;Accepts:Any
                    SingleQuote;['];
            MarkupTextLiteral - [18..21)::3 - [ />] - Gen<Markup> - SpanEditHandler;Accepts:Any
                Whitespace;[ ];
                ForwardSlash;[/];
                CloseAngle;[>];
        MarkupTextLiteral - [21..22)::1 - [}] - Gen<Markup> - SpanEditHandler;Accepts:Any
            Text;[}];
