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Test Info:

<html>
<head>
<script>
try { o1 = document.createElement('audio') } catch(e) { }
try { o2 = document.implementation.createDocument('', '', null).adoptNode(o1); } catch(e) { };
try { o3 = new AudioContext('alarm') } catch(e) { }
try { o3.createMediaElementSource(o1) } catch(e) { }
</script>
</head>
</html>