Markup block - Gen<None> - 16 - (0:0,0)
    Tag block - Gen<None> - 6 - (0:0,0)
        Transition span - Gen<None> - [<text>] - SpanEditHandler;Accepts:None - (0:0,0) - Symbols:3
            HtmlSymbolType.OpenAngle;[<];
            HtmlSymbolType.Text;[text];
            HtmlSymbolType.CloseAngle;[>];
    Markup span - Gen<Markup> - [Foo] - SpanEditHandler;Accepts:None - (6:0,6) - Symbols:1
        HtmlSymbolType.Text;[Foo];
    Tag block - Gen<None> - 7 - (9:0,9)
        Transition span - Gen<None> - [</text>] - SpanEditHandler;Accepts:None - (9:0,9) - Symbols:4
            HtmlSymbolType.OpenAngle;[<];
            HtmlSymbolType.ForwardSlash;[/];
            HtmlSymbolType.Text;[text];
            HtmlSymbolType.CloseAngle;[>];
