<!DOCTYPE html>
<html style="font: 1em/1 Ahem, sans-serif;">
<body>
<ruby>
PASS
<rt id="rt1"></rt>
<i>
<table id="table1"></table><table id="table2"><span><span>
</i>
</ruby>
</body>
<script>
document.body.offsetTop;
var table1 = document.getElementById('table1');
table1.parentNode.removeChild(table1);
document.body.offsetTop;
var table2 = document.getElementById('table2');
table2.parentNode.removeChild(table2);
document.body.offsetTop;
var rt1 = document.getElementById('rt1');
rt1.parentNode.removeChild(rt1);
</script>
</body>
</html>