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Test Info:

<html><head></head>↩
<body>↩
<basefont style="position: absolute;">↩
<div id="a" tabindex="1"><span style="position: absolute;"></span>↩
</div>↩
<script>↩
var y=document.getElementById('a');↩
y.focus();↩
</script>↩
</body></html>