RazorDocument - [0..16)::16 - [<foo>@@bar</foo>]
    MarkupBlock - [0..16)::16
        MarkupTagBlock - [0..5)::5 - [<foo>]
            MarkupTextLiteral - [0..5)::5 - [<foo>] - Gen<Markup> - SpanEditHandler;Accepts:Any
                OpenAngle;[<];
                Text;[foo];
                CloseAngle;[>];
        MarkupEphemeralTextLiteral - [5..6)::1 - [@] - Gen<None> - SpanEditHandler;Accepts:Any
            Transition;[@];
        MarkupTextLiteral - [6..10)::4 - [@bar] - Gen<Markup> - SpanEditHandler;Accepts:Any
            Transition;[@];
            Text;[bar];
        MarkupTagBlock - [10..16)::6 - [</foo>]
            MarkupTextLiteral - [10..16)::6 - [</foo>] - Gen<Markup> - SpanEditHandler;Accepts:Any
                OpenAngle;[<];
                ForwardSlash;[/];
                Text;[foo];
                CloseAngle;[>];
