diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/src/core/selection-transition.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/core/selection-transition.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,14 @@
+d3_selectionPrototype.transition = function() {
+  var subgroups = [],
+      subgroup,
+      node;
+
+  for (var j = -1, m = this.length; ++j < m;) {
+    subgroups.push(subgroup = []);
+    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
+      subgroup.push((node = group[i]) ? {node: node, delay: 0, duration: 250} : null);
+    }
+  }
+
+  return d3_transition(subgroups, d3_transitionInheritId || ++d3_transitionId, Date.now());
+};