Markup block - Gen<None> - 16 - (0:0,0)
    Tag block - Gen<None> - 16 - (0:0,0)
        Markup span - Gen<Markup> - [<a] - SpanEditHandler;Accepts:Any - (0:0,0) - Tokens:2
            HtmlTokenType.OpenAngle;[<];
            HtmlTokenType.Text;[a];
        Markup block - Gen<Attr:href, href='@(2:0,2),'@(12:0,12)> - 11 - (2:0,2)
            Markup span - Gen<None> - [ href='] - SpanEditHandler;Accepts:Any - (2:0,2) - Tokens:4
                HtmlTokenType.WhiteSpace;[ ];
                HtmlTokenType.Text;[href];
                HtmlTokenType.Equals;[=];
                HtmlTokenType.SingleQuote;['];
            Markup span - Gen<LitAttr:@(9:0,9)> - [Foo] - SpanEditHandler;Accepts:Any - (9:0,9) - Tokens:1
                HtmlTokenType.Text;[Foo];
            Markup span - Gen<None> - ['] - SpanEditHandler;Accepts:Any - (12:0,12) - Tokens:1
                HtmlTokenType.SingleQuote;['];
        Markup span - Gen<Markup> - [ />] - SpanEditHandler;Accepts:None - (13:0,13) - Tokens:3
            HtmlTokenType.WhiteSpace;[ ];
            HtmlTokenType.ForwardSlash;[/];
            HtmlTokenType.CloseAngle;[>];
