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Test Info:
<!DOCTYPE html>
<html class="reftest-wait">
<link rel='stylesheet' type='text/css' href='style.css'>
<script>
function onloadHandler()
{
var fieldsets = document.getElementsByTagName('fieldset');
fieldsets[0].disabled = false;
document.documentElement.className='';
}
</script>
<body onload="onloadHandler();">
<fieldset disabled class="enabled">
<fieldset class="enabled">
<button class="enabled"></button>
</fieldset>
</fieldset>
</body>
</html>