MarkupBlock - [0..34)::34 - [<foo><!DOCTYPE foo bar> baz></foo>]
    MarkupTagBlock - [0..5)::5 - [<foo>]
        MarkupTextLiteral - [0..5)::5 - [<foo>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            Text;[foo];
            CloseAngle;[>];
    MarkupTextLiteral - [5..23)::18 - [<!DOCTYPE foo bar>] - Gen<Markup> - SpanEditHandler;Accepts:None
        OpenAngle;[<];
        Bang;[!];
        Text;[DOCTYPE];
        Whitespace;[ ];
        Text;[foo];
        Whitespace;[ ];
        Text;[bar];
        CloseAngle;[>];
    MarkupTextLiteral - [23..28)::5 - [ baz>] - Gen<Markup> - SpanEditHandler;Accepts:Any
        Whitespace;[ ];
        Text;[baz];
        CloseAngle;[>];
    MarkupTagBlock - [28..34)::6 - [</foo>]
        MarkupTextLiteral - [28..34)::6 - [</foo>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            ForwardSlash;[/];
            Text;[foo];
            CloseAngle;[>];
