MarkupBlock - [0..14)::14 - [<p><foo></bar>]
    MarkupTagBlock - [0..3)::3 - [<p>]
        MarkupTextLiteral - [0..3)::3 - [<p>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            Text;[p];
            CloseAngle;[>];
    MarkupTagBlock - [3..8)::5 - [<foo>]
        MarkupTextLiteral - [3..8)::5 - [<foo>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            Text;[foo];
            CloseAngle;[>];
    MarkupTagBlock - [8..14)::6 - [</bar>]
        MarkupTextLiteral - [8..14)::6 - [</bar>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            ForwardSlash;[/];
            Text;[bar];
            CloseAngle;[>];
