MarkupBlock - [0..14)::14 - [<a><b></b></a>]
    MarkupTagBlock - [0..3)::3 - [<a>]
        MarkupTextLiteral - [0..3)::3 - [<a>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            Text;[a];
            CloseAngle;[>];
    MarkupTagBlock - [3..6)::3 - [<b>]
        MarkupTextLiteral - [3..6)::3 - [<b>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            Text;[b];
            CloseAngle;[>];
    MarkupTagBlock - [6..10)::4 - [</b>]
        MarkupTextLiteral - [6..10)::4 - [</b>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            ForwardSlash;[/];
            Text;[b];
            CloseAngle;[>];
    MarkupTagBlock - [10..14)::4 - [</a>]
        MarkupTextLiteral - [10..14)::4 - [</a>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            ForwardSlash;[/];
            Text;[a];
            CloseAngle;[>];
