MarkupBlock - [0..21)::21 - [<text></text foo bar>]
    MarkupTagBlock - [0..6)::6 - [<text>]
        MarkupTransition - [0..6)::6 - Gen<None> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            Text;[text];
            CloseAngle;[>];
    MarkupTagBlock - [6..21)::15 - [</text foo bar>]
        MarkupTransition - [6..21)::15 - Gen<None> - SpanEditHandler;Accepts:Any
            OpenAngle;[<];
            ForwardSlash;[/];
            Text;[text];
            Whitespace;[ ];
            Text;[foo];
            Whitespace;[ ];
            Text;[bar];
            CloseAngle;[>];
