MarkupBlock - [0..29)::29 - [<span data-foo='@foo'></span>]
    MarkupTagBlock - [0..22)::22 - [<span data-foo='@foo'>]
        MarkupTextLiteral - [0..5)::5 - [<span] - Gen<Markup> - SpanEditHandler;Accepts:Any
            OpenAngle;[<];
            Text;[span];
        MarkupAttributeBlock - [5..21)::16 - [ data-foo='@foo']
            MarkupTextLiteral - [5..6)::1 - [ ] - Gen<Markup> - SpanEditHandler;Accepts:Any
                Whitespace;[ ];
            MarkupTextLiteral - [6..14)::8 - [data-foo] - Gen<Markup> - SpanEditHandler;Accepts:Any
                Text;[data-foo];
            Equals;[=];
            MarkupTextLiteral - [15..16)::1 - ['] - Gen<None> - SpanEditHandler;Accepts:Any
                SingleQuote;['];
            GenericBlock - [16..20)::4
                MarkupDynamicAttributeValue - [16..20)::4 - [@foo]
                    GenericBlock - [16..20)::4
                        CSharpCodeBlock - [16..20)::4
                            CSharpImplicitExpression - [16..20)::4
                                CSharpTransition - [16..17)::1 - Gen<None> - SpanEditHandler;Accepts:None
                                    Transition;[@];
                                CSharpImplicitExpressionBody - [17..20)::3
                                    CSharpCodeBlock - [17..20)::3
                                        CSharpExpressionLiteral - [17..20)::3 - [foo] - Gen<Expr> - ImplicitExpressionEditHandler;Accepts:NonWhitespace;ImplicitExpression[RTD];K14
                                            Identifier;[foo];
            MarkupTextLiteral - [20..21)::1 - ['] - Gen<None> - SpanEditHandler;Accepts:Any
                SingleQuote;['];
        MarkupTextLiteral - [21..22)::1 - [>] - Gen<Markup> - SpanEditHandler;Accepts:None
            CloseAngle;[>];
    MarkupTagBlock - [22..29)::7 - [</span>]
        MarkupTextLiteral - [22..29)::7 - [</span>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            ForwardSlash;[/];
            Text;[span];
            CloseAngle;[>];
