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