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diff --git a/dom/media/webaudio/test/test_decodeMultichannel.html b/dom/media/webaudio/test/test_decodeMultichannel.html
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+++ b/dom/media/webaudio/test/test_decodeMultichannel.html
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+<!DOCTYPE HTML>
+<html>
+<meta charset=utf-8>
+<head>
+  <title>Test that we can decode multichannel file with webaudio and &lt;audio&gt;</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+var testcases = [
+  {
+    filename: "audio-quad.wav",
+    channels: 4
+  },
+  {
+    filename: "8kHz-320kbps-6ch.aac",
+    channels: 6
+  }
+];
+
+SimpleTest.waitForExplicitFinish();
+
+function decodeUsingAudioElement(filename, resolve) {
+  var a = new Audio();
+  a.addEventListener("error", function() {
+    ok(false, "Error loading metadata");
+    resolve();
+  });
+  a.addEventListener("loadedmetadata", function() {
+    ok(true, "Metadata Loaded");
+    resolve();
+  });
+
+  a.src = filename;
+  a.load();
+}
+
+function testOne({filename, channels}) {
+  return new Promise(resolve => {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", filename);
+    xhr.responseType = "arraybuffer";
+    xhr.onload = function() {
+      var context = new AudioContext();
+      context.decodeAudioData(xhr.response, function(b) {
+        ok(true, "Decoding of a wave file with four channels succeded.");
+        is(b.numberOfChannels,
+           channels,
+           `The AudioBuffer decoded from ${filename} should have ${channels} channels.`);
+        decodeUsingAudioElement(filename, resolve);
+      }, function() {
+        ok(false, `Decoding ${filename} failed)`);
+        decodeUsingAudioElement(filename, resolve);
+      });
+    };
+    xhr.send(null);
+  });
+}
+
+async function runTest() {
+  for (var testcase of testcases) {
+    await testOne(testcase);
+  }
+
+  SimpleTest.finish();
+}
+
+addLoadEvent(runTest);
+
+</script>
+</pre>
+</body>
+</html>