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diff --git a/dom/media/webaudio/test/test_maxChannelCount.html b/dom/media/webaudio/test/test_maxChannelCount.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test the AudioContext.destination interface</title>
+ <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="text/javascript" src="webaudio.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+// Work around bug 911777
+SpecialPowers.forceGC();
+SpecialPowers.forceCC();
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+ var ac = new AudioContext();
+ ok(ac.destination.maxChannelCount > 0, "We can query the maximum number of channels");
+
+ var oac = new OfflineAudioContext(2, 1024, 48000);
+ ok(oac.destination.maxChannelCount, 2, "This OfflineAudioContext should have 2 max channels.");
+
+ oac = new OfflineAudioContext(6, 1024, 48000);
+ ok(oac.destination.maxChannelCount, 6, "This OfflineAudioContext should have 6 max channels.");
+
+ expectException(function() {
+ oac.destination.channelCount = oac.destination.channelCount + 1;
+ }, DOMException.INDEX_SIZE_ERR);
+
+ SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>