- Selection.attr
Return the current value of the specified attribute for the first (non-null) element in the selectio
- Selection.append
Appends a new element of this type (tag name) as the last child of each selected element,
- Selection.call
Invoke the specified function exactly once, passing in this selection along with any optional argume
- Selection.selectAll
Create an empty sub-selection. Selection.selectAll does affect grouping: The elements in the returne
- Selection.data
Returns the array of data for the selected elements.