MarkupBlock - [0..19)::19 - [<a [(item,='Foo' />]
    MarkupTagBlock - [0..19)::19 - [<a [(item,='Foo' />]
        MarkupTextLiteral - [0..2)::2 - [<a] - Gen<Markup> - SpanEditHandler;Accepts:Any
            OpenAngle;[<];
            Text;[a];
        MarkupAttributeBlock - [2..16)::14 - [ [(item,='Foo']
            MarkupTextLiteral - [2..3)::1 - [ ] - Gen<Markup> - SpanEditHandler;Accepts:Any
                Whitespace;[ ];
            MarkupTextLiteral - [3..10)::7 - [[(item,] - Gen<Markup> - SpanEditHandler;Accepts:Any
                LeftBracket;[[];
                Text;[(item,];
            Equals;[=];
            MarkupTextLiteral - [11..12)::1 - ['] - Gen<None> - SpanEditHandler;Accepts:Any
                SingleQuote;['];
            GenericBlock - [12..15)::3
                MarkupLiteralAttributeValue - [12..15)::3 - [Foo]
                    MarkupTextLiteral - [12..15)::3 - [Foo] - Gen<Markup> - SpanEditHandler;Accepts:Any
                        Text;[Foo];
            MarkupTextLiteral - [15..16)::1 - ['] - Gen<None> - SpanEditHandler;Accepts:Any
                SingleQuote;['];
        MarkupTextLiteral - [16..19)::3 - [ />] - Gen<Markup> - SpanEditHandler;Accepts:None
            Whitespace;[ ];
            ForwardSlash;[/];
            CloseAngle;[>];
