diff --git a/XMLHttpRequest/event-readystatechange-loaded.htm b/XMLHttpRequest/event-readystatechange-loaded.htm
new file mode 100644
index 00000000000000..f2a22bf907e9bc
--- /dev/null
+++ b/XMLHttpRequest/event-readystatechange-loaded.htm
@@ -0,0 +1,36 @@
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <title>XMLHttpRequest: the LOADED state change should only happen once</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="http://dvcs.w3.org/hg/xhr/raw-file/tip/Overview.html#the-send()-method">
+</head>
+
+<div id="log"></div>
+
+<script>
+
+var test = async_test();
+
+test.step(function() {
+    var client = new XMLHttpRequest();
+    var countedLoading = 0;
+
+    client.onreadystatechange = test.step_func(function() {
+        if (client.readyState === 3) {
+            countedLoading += 1;
+        }
+
+        if (client.readyState === 4) {
+            assert_equals(countedLoading, 1, "LOADING state change may only be emitted once");
+
+            test.done();
+        }
+    });
+
+    client.open("GET", "resources/trickle.php?count=1000");
+    client.send(null);
+});
+</script>
diff --git a/XMLHttpRequest/response-data-progress.htm b/XMLHttpRequest/response-data-progress.htm
new file mode 100644
index 00000000000000..a4f890948ab07a
--- /dev/null
+++ b/XMLHttpRequest/response-data-progress.htm
@@ -0,0 +1,44 @@
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <title>XMLHttpRequest: progress events grow response body size</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="http://dvcs.w3.org/hg/xhr/raw-file/tip/Overview.html#the-send()-method">
+    <link rel="help" href="http://dvcs.w3.org/hg/xhr/raw-file/tip/Overview.html#handler-xhr-onprogress" data-tested-assertations="/../.." />
+    <link rel="help" href="http://dvcs.w3.org/hg/xhr/raw-file/tip/Overview.html#event-xhr-progress" data-tested-assertations="/../.." />
+</head>
+
+<div id="log"></div>
+
+<script>
+
+var test = async_test();
+
+test.step(function() {
+    var client = new XMLHttpRequest();
+    var lastSize = 0;
+
+    client.onprogress = test.step_func(function() {
+        var currentSize = client.responseText.length;
+
+        if (lastSize > 0 && currentSize > lastSize) {
+            // growth from a positive size to bigger!
+
+            test.done();
+        }
+
+        lastSize = currentSize;
+    });
+
+    client.onreadystatechange = test.step_func(function() {
+        if (client.readyState === 4) {
+            assert_unreached("onprogress not called multiple times, or response body did not grow.");
+        }
+    });
+
+    client.open("GET", "resources/trickle.php?count=1000");
+    client.send(null);
+});
+</script>
