Markup block - Gen<None> - 16 - (0:0,0)
    Markup span - Gen<Markup> - [<![CDATA[Foo]]>] - SpanEditHandler;Accepts:None - (0:0,0) - Symbols:9
        HtmlSymbolType.OpenAngle;[<];
        HtmlSymbolType.Bang;[!];
        HtmlSymbolType.LeftBracket;[[];
        HtmlSymbolType.Text;[CDATA];
        HtmlSymbolType.LeftBracket;[[];
        HtmlSymbolType.Text;[Foo];
        HtmlSymbolType.RightBracket;[]];
        HtmlSymbolType.RightBracket;[]];
        HtmlSymbolType.CloseAngle;[>];
    Markup span - Gen<Markup> - [ ] - SpanEditHandler;Accepts:None - (15:0,15) - Symbols:1
        HtmlSymbolType.WhiteSpace;[ ];
