diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/src/core/selection-classed.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/core/selection-classed.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,61 @@
+d3_selectionPrototype.classed = function(name, value) {
+  var names = name.split(d3_selection_classedWhitespace),
+      n = names.length,
+      i = -1;
+  if (arguments.length > 1) {
+    while (++i < n) d3_selection_classed.call(this, names[i], value);
+    return this;
+  } else {
+    while (++i < n) if (!d3_selection_classed.call(this, names[i])) return false;
+    return true;
+  }
+};
+
+var d3_selection_classedWhitespace = /\s+/g;
+
+function d3_selection_classed(name, value) {
+  var re = new RegExp("(^|\\s+)" + d3.requote(name) + "(\\s+|$)", "g");
+
+  // If no value is specified, return the first value.
+  if (arguments.length < 2) {
+    var node = this.node();
+    if (c = node.classList) return c.contains(name);
+    var c = node.className;
+    re.lastIndex = 0;
+    return re.test(c.baseVal != null ? c.baseVal : c);
+  }
+
+  function classedAdd() {
+    if (c = this.classList) return c.add(name);
+    var c = this.className,
+        cb = c.baseVal != null,
+        cv = cb ? c.baseVal : c;
+    re.lastIndex = 0;
+    if (!re.test(cv)) {
+      cv = d3_collapse(cv + " " + name);
+      if (cb) c.baseVal = cv;
+      else this.className = cv;
+    }
+  }
+
+  function classedRemove() {
+    if (c = this.classList) return c.remove(name);
+    var c = this.className,
+        cb = c.baseVal != null,
+        cv = cb ? c.baseVal : c;
+    cv = d3_collapse(cv.replace(re, " "));
+    if (cb) c.baseVal = cv;
+    else this.className = cv;
+  }
+
+  function classedFunction() {
+    (value.apply(this, arguments)
+        ? classedAdd
+        : classedRemove).call(this);
+  }
+
+  return this.each(typeof value === "function"
+      ? classedFunction : value
+      ? classedAdd
+      : classedRemove);
+}