diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/src/core/xhr.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/core/xhr.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,10 @@
+d3.xhr = function(url, mime, callback) {
+  var req = new XMLHttpRequest;
+  if (arguments.length < 3) callback = mime;
+  else if (mime && req.overrideMimeType) req.overrideMimeType(mime);
+  req.open("GET", url, true);
+  req.onreadystatechange = function() {
+    if (req.readyState === 4) callback(req.status < 300 ? req : null);
+  };
+  req.send(null);
+};