1 function d3_selection_enter(selection) {

     2   d3_arraySubclass(selection, d3_selection_enterPrototype);

     3   return selection;

     4 }

     5 

     6 var d3_selection_enterPrototype = [];

     7 

     8 d3_selection_enterPrototype.append = d3_selectionPrototype.append;

     9 d3_selection_enterPrototype.insert = d3_selectionPrototype.insert;

    10 d3_selection_enterPrototype.empty = d3_selectionPrototype.empty;

    11 d3_selection_enterPrototype.node = d3_selectionPrototype.node;