MarkupBlock - [0..22)::22 - [<a *something='Foo' />]
    MarkupTagBlock - [0..22)::22 - [<a *something='Foo' />]
        MarkupTextLiteral - [0..2)::2 - [<a] - Gen<Markup> - SpanEditHandler;Accepts:Any
            OpenAngle;[<];
            Text;[a];
        MarkupAttributeBlock - [2..19)::17 - [ *something='Foo']
            MarkupTextLiteral - [2..3)::1 - [ ] - Gen<Markup> - SpanEditHandler;Accepts:Any
                Whitespace;[ ];
            MarkupTextLiteral - [3..13)::10 - [*something] - Gen<Markup> - SpanEditHandler;Accepts:Any
                Text;[*something];
            Equals;[=];
            MarkupTextLiteral - [14..15)::1 - ['] - Gen<None> - SpanEditHandler;Accepts:Any
                SingleQuote;['];
            GenericBlock - [15..18)::3
                MarkupLiteralAttributeValue - [15..18)::3 - [Foo]
                    MarkupTextLiteral - [15..18)::3 - [Foo] - Gen<Markup> - SpanEditHandler;Accepts:Any
                        Text;[Foo];
            MarkupTextLiteral - [18..19)::1 - ['] - Gen<None> - SpanEditHandler;Accepts:Any
                SingleQuote;['];
        MarkupTextLiteral - [19..22)::3 - [ />] - Gen<Markup> - SpanEditHandler;Accepts:None
            Whitespace;[ ];
            ForwardSlash;[/];
            CloseAngle;[>];
