diff -r 000000000000 -r 6474c204b198 dom/workers/test/fibonacci_worker.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/workers/test/fibonacci_worker.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+onmessage = function(event) {
+  var n = parseInt(event.data);
+
+  if (n < 2) {
+    postMessage(n);
+    return;
+  }
+
+  var results = [];
+  for (var i = 1; i <= 2; i++) {
+    var worker = new Worker("fibonacci_worker.js");
+    worker.onmessage = function(event) {
+      results.push(parseInt(event.data));
+      if (results.length == 2) {
+        postMessage(results[0] + results[1]);
+      }
+    };
+    worker.postMessage(n - i);
+  }
+}