Changes
{{Infobox
| title = Top level title
| data1 = {{Infobox|decat=y
| child = yes
| title = First subsection
| data1 = Data 1.1
}}
| data2 = {{Infobox|decat=y
| child = yes
| title = Second subsection
{{Infobox
| title = Top level title
| header1 = {{Infobox|decat=y
| child = yes
| title = First subsection
| data1 = Data 1.1
}}
| header2 = {{Infobox|decat=y
| child = yes
| title = Second subsection
| title = Top level title
| header1 = First subsection
{{Infobox|decat=y
| child = yes
| label1= Label 1.1
}}
| header2 = Second subsection
{{Infobox|decat=y
| child = yes
| label1= Label 2.1