MarkupBlock - [0..33)::33 - [<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..27)::22 - [<!DOCTYPE foo bar baz>] - Gen<Markup> - SpanEditHandler;Accepts:None
        OpenAngle;[<];
        Bang;[!];
        Text;[DOCTYPE];
        Whitespace;[ ];
        Text;[foo];
        Whitespace;[ ];
        Text;[bar];
        Whitespace;[ ];
        Text;[baz];
        CloseAngle;[>];
    MarkupTagBlock - [27..33)::6 - [</foo>]
        MarkupTextLiteral - [27..33)::6 - [</foo>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            ForwardSlash;[/];
            Text;[foo];
            CloseAngle;[>];
