gecko-dev/content/media/webaudio/test/test_AudioContext.html

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<!DOCTYPE HTML>
<html>
<head>
<title>Test whether we can create an AudioContext interface</title>
<script type="text/javascript" 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">
SimpleTest.waitForExplicitFinish();
addLoadEvent(function() {
var ac = new AudioContext();
ok(ac, "Create a AudioContext object");
is(ac.sampleRate, 48000, "Correct sample rate");
ok(ac instanceof EventTarget, "AudioContexts must be EventTargets");
SimpleTest.finish();
});
</script>
</pre>
</body>
</html>