Markup block - Gen<None> - 16 - (0:0,0)
    Markup span - Gen<Markup> - [<!DOCTYPE html>] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:6
        HtmlTokenType.OpenAngle;[<];
        HtmlTokenType.Bang;[!];
        HtmlTokenType.Text;[DOCTYPE];
        HtmlTokenType.WhiteSpace;[ ];
        HtmlTokenType.Text;[html];
        HtmlTokenType.CloseAngle;[>];
    Markup span - Gen<Markup> - [ ] - SpanEditHandler;Accepts:None - (15:0,15) - Tokens:1
        HtmlTokenType.WhiteSpace;[ ];
