实例如下：
<!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd>
<span xss=removed>
<select>
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<div style=position:absolute;wi
