Markup block - Gen<None> - 28 - (0:0,0)
    Tag block - Gen<None> - 28 - (0:0,0)
        Markup span - Gen<Markup> - [<                      LF   ] - SpanEditHandler;Accepts:Any - (0:0,0) - Symbols:4
            HtmlSymbolType.OpenAngle;[<];
            HtmlSymbolType.WhiteSpace;[                      ];
            HtmlSymbolType.NewLine;[LF];
            HtmlSymbolType.WhiteSpace;[   ];
