MarkupBlock - [0..11)::11 - [<p>Foo</p> ]
    MarkupTagBlock - [0..3)::3 - [<p>]
        MarkupTextLiteral - [0..3)::3 - [<p>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            Text;[p];
            CloseAngle;[>];
    MarkupTextLiteral - [3..6)::3 - [Foo] - Gen<Markup> - SpanEditHandler;Accepts:Any
        Text;[Foo];
    MarkupTagBlock - [6..10)::4 - [</p>]
        MarkupTextLiteral - [6..10)::4 - [</p>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            ForwardSlash;[/];
            Text;[p];
            CloseAngle;[>];
    MarkupTextLiteral - [10..11)::1 - [ ] - Gen<Markup> - SpanEditHandler;Accepts:None
        Whitespace;[ ];
