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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
d.setAttribute('dir', "auto");
c.setAttribute('dir', "auto");
d.removeAttribute('dir');
c.removeAttribute('dir');
b.setAttribute('dir', "auto");
}
</script>
</head>
<body onload="boom();">
<div id="a" dir="auto"><div id="b"><div id="c"><div id="d"></div></div></div></div>
</body>
</html>