1 d3_transitionPrototype.selectAll = function(selector) {

     2   var subgroups = [],

     3       subgroup,

     4       subnodes,

     5       node;

     6 

     7   if (typeof selector !== "function") selector = d3_selection_selectorAll(selector);

     8 

     9   for (var j = -1, m = this.length; ++j < m;) {

    10     for (var group = this[j], i = -1, n = group.length; ++i < n;) {

    11       if (node = group[i]) {

    12         subnodes = selector.call(node.node, node.node.__data__, i);

    13         subgroups.push(subgroup = []);

    14         for (var k = -1, o = subnodes.length; ++k < o;) {

    15           subgroup.push({node: subnodes[k], delay: node.delay, duration: node.duration});

    16         }

    17       }

    18     }

    19   }

    20 

    21   return d3_transition(subgroups, this.id, this.time).ease(this.ease());

    22 };