<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="../helper.js"></script>
</head>
<body>
<h1>PageVisibility</h1>
<div id="log" style="font-family: monospace;"></div>
</body>
</html>