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<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="videomask.css" />
</head>
<body style="text-align: right">
<audio
controls
preload="none"
id="av"
source="audio.wav"
style="direction: rtl"
></audio>
<div id="mask"></div>
</body>
</html>