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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test MediaRecorder Bitrate</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <script type="text/javascript" src="manifest.js"></script>
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+var manager = new MediaTestManager;
+var results = [];
+
+/**
+ * Starts a test on every media recorder file included to check that
+ * the bitrate control works
+ */
+function startTest(test, token) {
+  manager.started(token);
+  runTest(test, token, 1000000);
+  runTest(test, token, 100000);
+}
+
+function runTest(test, token, bitrate) {
+  var element = document.createElement('video');
+
+  element.token = token;
+
+  element.src = test.name;
+  element.preload = "metadata";
+  element.onloadedmetadata = function () {
+    info("loadedmetadata");
+    const stream = element.mozCaptureStreamUntilEnded();
+    element.onloadedmetadata = null;
+    element.play();
+
+    const mediaRecorder = new MediaRecorder(stream, {videoBitsPerSecond: bitrate});
+    mediaRecorder.start();
+    is(mediaRecorder.state, 'recording', 'Media recorder should be recording');
+    is(mediaRecorder.stream, stream,
+     'Media recorder stream = element stream at the start of recording');
+
+    var onStopFired = false;
+    var onDataAvailableFired = false;
+    var encoded_size = 0;
+
+    mediaRecorder.onerror = function () {
+      ok(false, 'Unexpected onerror callback fired');
+    };
+
+    mediaRecorder.onwarning = function () {
+      ok(false, 'Unexpected onwarning callback fired');
+    };
+
+    // This handler verifies that only a single onstop event handler is fired.
+    mediaRecorder.onstop = function () {
+      if (onStopFired) {
+        ok(false, 'onstop unexpectedly fired more than once');
+      } else {
+        onStopFired = true;
+
+        // ondataavailable should always fire before onstop
+        if (onDataAvailableFired) {
+          ok(true, 'onstop fired after ondataavailable');
+          info("test " + test.name + " encoded@" + bitrate + "=" + encoded_size);
+          if (results[test.name]) {
+            var big, small, temp;
+            big = {};
+            big.bitrate = bitrate;
+            big.size = encoded_size;
+            small = results[test.name];
+            // Don't assume the order that these will finish in
+            if (results[test.name].bitrate > bitrate) {
+              temp = big;
+              big = small;
+              small = temp;
+            }
+            // Ensure there is a big enough difference in the encoded
+            // sizes
+            ok(small.size*1.25 < big.size,
+               test.name + ' encoded@' + big.bitrate + '=' + big.size +
+               ' > encoded@' + small.bitrate + '=' + small.size);
+            manager.finished(token);
+          } else {
+            results[test.name] = {};
+            results[test.name].bitrate = bitrate;
+            results[test.name].size = encoded_size;
+          }
+        } else {
+          ok(false, 'onstop fired without an ondataavailable event first');
+        }
+      }
+    };
+
+    // This handler verifies that only a single ondataavailable event handler
+    // is fired with the blob generated having greater than zero size
+    // and a correct mime type.
+    mediaRecorder.ondataavailable = function (evt) {
+      if (onDataAvailableFired) {
+        ok(false, 'ondataavailable unexpectedly fired more than once');
+      } else {
+        onDataAvailableFired = true;
+
+        ok(evt instanceof BlobEvent,
+           'Events fired from ondataavailable should be BlobEvent');
+        is(evt.type, 'dataavailable',
+           'Event type should dataavailable');
+        ok(evt.data.size > 0,
+           'Blob data received should be greater than zero');
+        encoded_size = evt.data.size;
+
+        // onstop should not have fired before ondataavailable
+        if (onStopFired) {
+          ok(false, 'ondataavailable unexpectedly fired later than onstop');
+          manager.finished(token);
+        }
+      }
+    };
+  };
+}
+
+manager.runTests(gMediaRecorderVideoTests, startTest);
+</script>
+</pre>
+</body>
+</html>