Markup block - Gen<None> - 33 - (0:0,0)
    Tag block - Gen<None> - 5 - (0:0,0)
        Markup span - Gen<Markup> - [<foo>] - SpanEditHandler;Accepts:None - (0:0,0) - Symbols:3
            HtmlSymbolType.OpenAngle;[<];
            HtmlSymbolType.Text;[foo];
            HtmlSymbolType.CloseAngle;[>];
    Markup span - Gen<Markup> - [<!DOCTYPE foo bar baz>] - SpanEditHandler;Accepts:None - (5:0,5) - Symbols:10
        HtmlSymbolType.OpenAngle;[<];
        HtmlSymbolType.Bang;[!];
        HtmlSymbolType.Text;[DOCTYPE];
        HtmlSymbolType.WhiteSpace;[ ];
        HtmlSymbolType.Text;[foo];
        HtmlSymbolType.WhiteSpace;[ ];
        HtmlSymbolType.Text;[bar];
        HtmlSymbolType.WhiteSpace;[ ];
        HtmlSymbolType.Text;[baz];
        HtmlSymbolType.CloseAngle;[>];
    Tag block - Gen<None> - 6 - (27:0,27)
        Markup span - Gen<Markup> - [</foo>] - SpanEditHandler;Accepts:None - (27:0,27) - Symbols:4
            HtmlSymbolType.OpenAngle;[<];
            HtmlSymbolType.ForwardSlash;[/];
            HtmlSymbolType.Text;[foo];
            HtmlSymbolType.CloseAngle;[>];
