Markup block - Gen<None> - 31 - (0:0,0)
    Tag block - Gen<None> - 5 - (0:0,0)
        Markup span - Gen<Markup> - [<foo>] - SpanEditHandler;Accepts:Any - (0:0,0) - Tokens:3
            HtmlTokenType.OpenAngle;[<];
            HtmlTokenType.Text;[foo];
            HtmlTokenType.CloseAngle;[>];
    Markup span - Gen<Markup> - [<?xml Hello World ?>] - SpanEditHandler;Accepts:Any - (5:0,5) - Tokens:10
        HtmlTokenType.OpenAngle;[<];
        HtmlTokenType.QuestionMark;[?];
        HtmlTokenType.Text;[xml];
        HtmlTokenType.WhiteSpace;[ ];
        HtmlTokenType.Text;[Hello];
        HtmlTokenType.WhiteSpace;[ ];
        HtmlTokenType.Text;[World];
        HtmlTokenType.WhiteSpace;[ ];
        HtmlTokenType.QuestionMark;[?];
        HtmlTokenType.CloseAngle;[>];
    Tag block - Gen<None> - 6 - (25:0,25)
        Markup span - Gen<Markup> - [</foo>] - SpanEditHandler;Accepts:Any - (25:0,25) - Tokens:4
            HtmlTokenType.OpenAngle;[<];
            HtmlTokenType.ForwardSlash;[/];
            HtmlTokenType.Text;[foo];
            HtmlTokenType.CloseAngle;[>];
