Selection
Node
Node
Node
Node
Data
Item
Item
Item
Item
data()
Selection
Node
Node
Data
Item
Item
Item
Item
data()
enter()
Selection
Node
Node
Node
Node
Data
Item
Item
data()
exit()
Selection
Node 'a'
Node 'b'
Node 'c'
Data
Item 'z'
Item 'c'
Item 'b'
data()
exit()
enter()
Selection
Node 'a'
Node 'a'
Node 'b'
Data
Item 'a'
Item 'b'
Item 'b'
data()
exit()
data()
enter()