diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/src/compat/style.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/compat/style.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,9 @@
+try {
+  document.createElement("div").style.setProperty("opacity", 0, "");
+} catch (error) {
+  var d3_style_prototype = CSSStyleDeclaration.prototype,
+      d3_style_setProperty = d3_style_prototype.setProperty;
+  d3_style_prototype.setProperty = function(name, value, priority) {
+    d3_style_setProperty.call(this, name, value + "", priority);
+  };
+}