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+<!DOCTYPE HTML>
+<!-- Any copyright is dedicated to the Public Domain.
+   - https://creativecommons.org/publicdomain/zero/1.0/ -->
+<html>
+
+<head>
+  <title>Video controls test</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <script type="text/javascript" src="head.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css" />
+</head>
+
+<body>
+  <p id="display"></p>
+
+  <div id="content">
+    <video width="320" height="240" id="video" controls></video>
+  </div>
+
+  <div id="host"></div>
+
+  <pre id="test">
+<script class="testbody">
+  add_task(async function test_src_change() {
+    const video = document.getElementById("video");
+
+    function changeMediaSource(src) {
+      let loaded = new Promise((resolve) => video.addEventListener("loadeddata", resolve, { once: true }));
+      video.src = src;
+      return loaded;
+    }
+
+    const muteButton = getElementWithinVideo(video, "muteButton");
+
+    await changeMediaSource("video.webm");
+
+    ok(muteButton.hasAttribute("noAudio"), "noAudio attribute is present when the video has no audio track");
+    ok(muteButton.disabled, "Mute button is disabled when the video has no audio track");
+
+    await changeMediaSource("seek_with_sound.webm");
+
+    ok(!muteButton.hasAttribute("noAudio"), "noAudio attribute is not present when the video has an audio track");
+    ok(!muteButton.disabled, "Mute button is enabled when the video has an audio track");
+
+    await changeMediaSource("video.webm");
+
+    ok(muteButton.hasAttribute("noAudio"), "noAudio attribute is present when the video has no audio track")
+    ok(muteButton.disabled, "Mute button is disabled when the video has no audio track");
+  });
+
+</script>
+</pre>
+</body>
+
+</html>