RazorDocument - [0..22)::22 - [{<span foo='abc@@' />}]
    MarkupBlock - [0..22)::22
        MarkupTextLiteral - [0..1)::1 - [{] - Gen<Markup> - SpanEditHandler;Accepts:Any
            Text;[{];
        MarkupTagBlock - [1..21)::20 - [<span foo='abc@@' />]
            MarkupTextLiteral - [1..6)::5 - [<span] - Gen<Markup> - SpanEditHandler;Accepts:Any
                OpenAngle;[<];
                Text;[span];
            MarkupAttributeBlock - [6..18)::12 - [ foo='abc@@']
                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
                    MarkupLiteralAttributeValue - [12..15)::3 - [abc]
                        MarkupTextLiteral - [12..15)::3 - [abc] - Gen<Markup> - SpanEditHandler;Accepts:Any
                            Text;[abc];
                    MarkupBlock - [15..17)::2
                        MarkupTextLiteral - [15..16)::1 - [@] - Gen<LitAttr:@(15:0,15)> - SpanEditHandler;Accepts:None
                            Transition;[@];
                        MarkupEphemeralTextLiteral - [16..17)::1 - [@] - Gen<None> - SpanEditHandler;Accepts:None
                            Transition;[@];
                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;[}];
