diff -r 000000000000 -r 6474c204b198 dom/workers/test/xhr_worker.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/workers/test/xhr_worker.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,84 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+var xhr = new XMLHttpRequest();
+
+function onload(event) {
+  if (event.target != xhr) {
+    throw "onload event.target != xhr";
+  }
+
+  if (event.target.status != 200) {
+    var message = { type: "error",
+                    error: event.target.status };
+    postMessage(message);
+  }
+
+  var message = { type: "load",
+                  data: xhr.responseText };
+  postMessage(message);
+}
+
+xhr.onload = onload;
+xhr.addEventListener("load", onload, false);
+xhr.removeEventListener("load", onload, false);
+if (!xhr.onload) {
+  var message = { type: "error",
+                  error: "Lost message listener!" };
+  postMessage(message);
+}
+
+xhr.onerror = function(event) {
+  if (event.target != xhr) {
+    throw "onerror event.target != xhr";
+  }
+  var message = { type: "error",
+                  error: event.target.status };
+  postMessage(message);
+};
+xhr.onerror = xhr.onerror;
+if (!xhr.onerror || xhr.onerror != xhr.onerror) {
+  throw "onerror wasn't set properly";
+}
+
+function onprogress(event) {
+  if (event.target != xhr) {
+    throw "onprogress event.target != xhr";
+  }
+  var message = { type: "progress",
+                  current: event.loaded,
+                  total: event.total };
+  postMessage(message);
+}
+xhr.addEventListener("progress", onprogress, false);
+
+xhr.addEventListener("foopety", function(event) {}, false);
+xhr.removeEventListener("doopety", function(event) {}, false);
+
+xhr.onloadend = function(event) {
+  var message = { type: "loadend" };
+  postMessage(message);  
+}
+
+var upload = xhr.upload;
+upload.onprogress = function(event) { };
+upload.addEventListener("foo", function(event) { }, false);
+upload.removeEventListener("foo", function(event) { }, false);
+upload.addEventListener("load", function(event) { }, false);
+upload.removeEventListener("foo", function(event) { }, false);
+upload.onload = function(event) {
+  var message = { type: "upload.load" };
+  postMessage(message);
+}
+
+onmessage = function(event) {
+  if (xhr.DONE != 4 || XMLHttpRequest.DONE != 4) {
+    throw "xhr constants not correct!";
+  }
+  if (xhr.readystate > xhr.UNSENT) {
+    throw "XHR already running!";
+  }
+  xhr.open("POST", event.data);
+  xhr.send("Data to send");
+}