Markup block - Gen<None> - 3 - (0:0,0)
    Tag block - Gen<None> - 3 - (0:0,0)
        Markup span - Gen<Markup> - [<] - SpanEditHandler;Accepts:Any - (0:0,0) - Tokens:1
            HtmlTokenType.OpenAngle;[<];
        MetaCode span - Gen<None> - [!] - SpanEditHandler;Accepts:None - (1:0,1) - Tokens:1
            HtmlTokenType.Bang;[!];
        Markup span - Gen<Markup> - [p] - SpanEditHandler;Accepts:Any - (2:0,2) - Tokens:1
            HtmlTokenType.Text;[p];
