MarkupBlock - [0..16)::16 - [<!DOCTYPE html> ]
    MarkupTextLiteral - [0..15)::15 - [<!DOCTYPE html>] - Gen<Markup> - SpanEditHandler;Accepts:None
        OpenAngle;[<];
        Bang;[!];
        Text;[DOCTYPE];
        Whitespace;[ ];
        Text;[html];
        CloseAngle;[>];
    MarkupTextLiteral - [15..16)::1 - [ ] - Gen<Markup> - SpanEditHandler;Accepts:None
        Whitespace;[ ];
