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+<!doctype html>
+<html>
+<head>
+<title>Adding a track to an inactive MediaStream</title>
+<link rel="author" title="Dominique Hazael-Massieux" href="mailto:dom@w3.org"/>
+<link rel="help" href="http://w3c.github.io/mediacapture-main/getusermedia.html#widl-MediaStream-addTrack-void-MediaStreamTrack-track">
+<link rel="help" href="http://w3c.github.io/mediacapture-main/getusermedia.html#widl-MediaStreamTrack-stop-void">
+</head>
+<body>
+<p class="instructions">When prompted, accept to share your audio stream, then
+your video stream.</p>
+<h1 class="instructions">Description</h1>
+<p class="instructions">This test checks that adding a track to an inactive
+MediaStream is allowed.</p>
+
+<div id='log'></div>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src="/common/vendor-prefix.js" data-prefixed-objects='[{"ancestors":["navigator"], "name":"getUserMedia"}]'></script>
+<script>
+var t = async_test("Tests that adding a track to an inactive MediaStream is allowed", {timeout:20000});
+t.step(function () {
+  var audio, video;
+
+  navigator.getUserMedia({audio:true}, gotAudio, function() {});
+  function gotAudio(stream) {
+    audio = stream;
+    navigator.getUserMedia({video:true}, gotVideo, function() {});
+  }
+
+  function gotVideo(stream) {
+    video = stream;
+    t.step(function () {
+       audio.getAudioTracks()[0].stop();
+       assert_false(audio.active, "audio stream is inactive after stopping its only audio track");
+       assert_true(video.active, "video stream is active");
+       audio.addTrack(video.getVideoTracks()[0]);
+       audio.removeTrack(audio.getAudioTracks()[0]);
+     });
+    t.done();
+  }
+});
+</script>
+</body>
+</html>