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Test Info:

<html>
<head>
<style>
HTML:first-line, DIV { position:fixed }
</style>
<script>
try { o1 = document.createElement('DIV') } catch(e) { }
try { document.documentElement.appendChild(o1) } catch(e) { }
try { document.documentElement.getBoundingClientRect() } catch(e) { }
try { document.styleSheets[0].cssRules[0].style['position'] = 'relative' } catch(e) { }
</script>
</head>
</html>