Markup block - Gen<None> - 18 - (0:0,0)
    HtmlComment block - Gen<None> - 18 - (0:0,0)
        Markup span - Gen<Markup> - [<!--] - SpanEditHandler;Accepts:None - (0:0,0) - Symbols:3
            HtmlSymbolType.OpenAngle;[<];
            HtmlSymbolType.Bang;[!];
            HtmlSymbolType.DoubleHyphen;[--];
        Markup span - Gen<Markup> - [<foo></bar>] - SpanEditHandler;Accepts:WhiteSpace - (4:0,4) - Symbols:7
            HtmlSymbolType.OpenAngle;[<];
            HtmlSymbolType.Text;[foo];
            HtmlSymbolType.CloseAngle;[>];
            HtmlSymbolType.OpenAngle;[<];
            HtmlSymbolType.ForwardSlash;[/];
            HtmlSymbolType.Text;[bar];
            HtmlSymbolType.CloseAngle;[>];
        Markup span - Gen<Markup> - [-->] - SpanEditHandler;Accepts:None - (15:0,15) - Symbols:2
            HtmlSymbolType.DoubleHyphen;[--];
            HtmlSymbolType.CloseAngle;[>];
